LOGIC OF RECEPTS.

We have seen that the great border-land, or terra media, lying between particular ideas and general ideas has been strangely neglected by psychologists, and we may now be prepared to find that a careful exploration of this border-land is a matter of the highest importance for the purposes of our inquiry. I will, therefore, devote the present chapter to a full consideration of what I have termed generic ideas, or recepts.

It has already been remarked that, in order to form any of these generic ideas, the mind does not require to combine intentionally the particular ideas which go to construct it: a recept differs from a concept in that it is received, not conceived. The percepts out of which a recept is composed are of so comparatively simple a character, are so frequently repeated in observation, and present among themselves resemblances or analogies so obvious, that the mental images of them run together, as it were, spontaneously, or in accordance with the primary laws of merely sensuous association, without requiring any conscious act of comparison. This is a truth which has been noticed by several previous writers. For instance, I have in this connection already quoted a passage from M. Taine, and, if necessary, could quote another, wherein he very aptly likens what I have called recepts to the unelaborated ore out of which the metal of a concept is afterwards smelted. And still more to the purpose is the following passage, which I take from Mr. Sully:—“The more concrete concepts, or generic images, are formed to a large extent by a passive process of assimilation. The likeness among dogs, for example, is so great and striking that when a child, already familiar with one of these animals, sees a second, he recognizes it as identical with the first in certain obvious respects. The representation of the first combines with the representation of the second, bringing into distinct relief the common dog features, more particularly the canine form. In this way the images of different dogs come to overlap, so to speak, giving rise to a typical image of dog. Here there is very little of active direction of the mind from one thing to another in order to discover where the resemblance lies: the resemblance forces itself upon the mind. When, however, the resemblance is less striking, as in the case of more abstract concepts, a distinct operation of active comparison is involved.”[26]

Similarly, M. Perez remarks, “the necessity which children are under of seeing in a detached and scrappy manner in order to see well, makes them continually practise that kind of abstraction by which we separate qualities from objects. From those objects which the child has already distinguished as individual, there come to him at different moments particularly vivid impressions.... Dominant sensations of this kind, by their energy or frequency, tend to efface the idea of the objects from which they proceed, to separate or abstract themselves.... The flame of a candle is not always equally bright or flickering; tactile, sapid, olfactory, and auditive impressions do not always strike the child’s sensorium with the same intensity, nor during the same length of time. This is why the recollections of individual forms, although strongly graven on their intelligence, lose by degrees their first precision, so that the idea of a tree, for instance, furnished by direct and perfectly distinct memories, comes back to the mind in a vague and indistinct form, which might be taken for a general idea.”[27]

Again, in the opinion of John Stuart Mill, “It is the doctrine of one of the most fertile thinkers of modern times, Auguste Comte, that besides the logic of signs, there is a logic of images, and a logic of feelings. In many of the familiar processes of thought, and especially in uncultured minds, a visual image serves instead of a word. Our visual sensations, perhaps only because they are almost always present along with the impressions of our other senses, have a facility of becoming associated with them. Hence, the characteristic visual appearance of an object easily gathers round it, by association, the ideas of all other peculiarities which have, in frequent experience, co-existed with that appearance; and, summoning up these with a strength and certainty far surpassing that of merely casual associations which it may also raise, it concentrates the attention on them. This is an image serving for a sign—the logic of images. The same function may be fulfilled by a feeling. Any strong and highly interesting feeling, connected with one attribute of a group, spontaneously classifies all objects according as they possess, or do not possess, that attribute. We may be tolerably certain that the things capable of satisfying hunger form a perfectly distinct class in the mind of any of the more intelligent animals; quite as much as if they were able to use or understand the word food. We here see in a strong light the important truth that hardly anything universal can be affirmed in psychology except the laws of association.”[28]

Furthermore, Mansel tersely conveys the truth which I am endeavouring to present, thus:—“The mind recognizes the impression which a tree makes on the retina of the eye: this is presentative consciousness. It then depicts it. From many such pictures it forms a general notion, and to that notion it at last appropriates a name.”[29] Almost in identical language the same distinction is conveyed by NoirÉ thus:—“All trees hitherto seen by me may leave in my imagination a mixed image, a kind of ideal representation of trees. Quite different from this is the concept, which is never an image.”[30]

And, not to overburden the argument with quotations, I will furnish but one more, which serves if possible with still greater clearness to convey exactly what it is that I mean by a recept. Professor Huxley writes:—“An anatomist who occupies himself intently with the examination of several specimens of some new kind of animal, in course of time acquires so vivid a conception of its form and structure, that the idea may take visible shape and become a sort of waking dream.”[31]

Although the use of the word “conception” here is unfortunate in one way, I regard it as fortunate in another: it shows how desperate is the need for the word which I have coined.

The above quotations, then, may be held sufficient to show that the distinction which I have drawn has not been devised merely to suit my own purposes. All that I have endeavoured so far to do is to bring this distinction into greater clearness, by assigning to each of its parts a separate name. And in doing this I have not assumed that the two orders of generalization comprised under recepts and concepts are the same in kind. So far I have left the question open as to whether a mind which can only attain to recepts differs in degree or in kind from the intellect which is able to go on to the formation of concepts. Had I said, with Sully, “When the resemblance is less striking, as in the case of more abstract concepts, a distinct operation of active comparison is involved,” I should have been assuming that there is only a difference of degree between a recept and a concept: designating both by the same term, and therefore implying that they differ only in their level of abstraction, I should have assumed that what he calls the “passive process of assimilation,” whereby an infant or an animal recognizes an individual man as belonging to a class, is really the same kind of psychological process as that which is involved “in the case of more abstract concepts,” where the individual man is designated by a proper name, while the class to which he belongs is designated by a common name. Similarly, if I had said, with Thomas Brown, that in the process of generalization there is, “in the first place, the perception of two or more objects [percept]; in the second place, the feeling of their resemblance [recept]; and, lastly, the expression of this common relative feeling by a name, afterwards used as a general name [concept];”—if I had spoken thus, I should have virtually begged the question as to the universal continuity of ideation, both in brutes and men. Of course this is the conclusion towards which I am working; but my endeavour in doing so is to proceed in the proof step by step, without anywhere pre-judging my case. These passages, therefore, I have quoted merely because they recognize more clearly than others which I have happened to meet with what I conceive to be the true psychological classification of ideas; and although, with the exception of that quoted from Mill, no one of the passages shows that its writer had before his mind the case of animal intelligence—or perceived the immense importance of his statements in relation to the question which we have to consider,—this only renders of more value their independent testimony to the soundness of my classification.[32]

The question, then, which we have to consider is whether there is a difference of kind, or only a difference of degree, between a recept and a concept. This is really the question with which the whole of the present volume will be concerned, and as its adequate treatment will necessitate somewhat laborious inquiries in several directions, I will endeavour to keep the various issues distinct by fully working out each branch of the subject before entering upon the next.

First of all I will show, by means of illustrations, the highest levels of ideation that are attained within the domain of recepts; and, in order to do this, I will adduce my evidence from animals alone, seeing that here there can be no suspicion—as there might be in the case of infants—that the logic of recepts is assisted by any nascent growth of concepts. But, before proceeding to state this evidence, it seems desirable to say a few words on what I mean by the term just used, namely, Logic of Recepts.

As argued in my previous work, all mental processes of an adaptive kind are, in their last resort, processes of classification: they consist in discriminating between differences and resemblances. An act of simple perception is an act of noticing resemblances and differences between the objects of such perception; and, similarly, an act of conception is the taking together—or the intentional putting together—of ideas which are recognized as analogous. Hence abstraction has to do with the abstracting of analogous qualities; reason is ratiocination, or the comparison of ratios; and thus the highest operations of thought, like the simplest acts of perception, are concerned with the grouping or co-ordination of resemblances, previously distinguished from differences.[33] Consequently, the middle ground of ideation, or the territory occupied by recepts, is concerned with this same process on a plane higher than that which is occupied by percepts, though lower than that which is occupied by concepts. In short, the object or use, and therefore the method or logic, of all ideation is the same. It is, indeed, customary to restrict the latter term to the higher plane of ideation, or to that which has to do with concepts. But, as Comte has shown, there is no reason why, for purposes of special exposition, this term should not be extended so as to embrace all operations of the mind, in so far as these are operations of an orderly kind. For in so far as they are orderly or adaptive—and not merely sentient or indifferent—such operations all consist, as we have just seen, in processes of ideal grouping, or binding together.[34] And therefore I see no impropriety in using the word Logic for the special purpose of emphasizing the fundamental identity of all ideation—so far, that is, as its method is concerned. I object, however, to the terms “Logic of Feelings” and “Logic of Signs.” For, on the one hand, “Feelings,” have to do primarily with the sentient and emotional side of mental life, as distinguished from the intellectual or ideational. And, on the other hand, “Signs” are the expressions of ideas; not the ideas themselves. Hence, whatever method, or meaning, they may present is but a reflection of the order, or grouping, among the ideas which they are used to express. The logic, therefore, is neither in the feelings nor in the signs; but in the ideas. On this account I have substituted for the above terms what I take to be more accurate designations—namely, the Logic of Recepts, and the Logic of Concepts.[35]

In the present chapter we have only to consider the logic of recepts, and, in order to do so efficiently, we may first of all briefly note that even within the region of percepts we meet with a process of spontaneous grouping of like with like, which, in turn, leads us downwards to the purely unconscious or mechanical grouping of stimuli in the lower nerve-centres. So that, as fully argued out in my previous work, on its objective face the method has everywhere been the same: whether in the case of reflex action, of sensation, perception, reception, conception, or reflection, on the side of the nervous system, the method of evolution has been uniform: “it has everywhere consisted in a progressive development of the power of discriminating between stimuli, joined with the complementary power of adaptive response.”[36] But although this is a most important truth to recognize (as it appears to have been implicitly recognized—or, rather, accidentally implied—by using a variant of the same term to designate the lowest and the highest members of the above-named series of faculties), for the purposes of psychological as distinguished from physiological inquiry, it is convenient to disregard the objective side of this continuous process, and therefore to take up our analysis at the place where it is attended by a subjective counterpart—that is, at Perception.

So much has already been written on what is termed the “unconscious judgments” or “intuitive judgments” incidental to all our acts of perception, that I feel it is needless to occupy space by dwelling at any length upon this subject. The familiar illustration of looking straight into a polished bowl, and alternately perceiving it as a bowl and a sphere, is enough to show that here we do have a logic of feelings: without any act of ideation, but simply in virtue of an automatic grouping of former percepts, the mind spontaneously infers—or unconsciously judges—that an object, which must either be a bowl or a sphere, is now one and now the other.[37] From which we gather that all our visual perceptions are thus of the nature of automatic inferences, based upon previous correspondencies between them and perceptions of touch. From which, again, we gather that perceptions of every kind depend upon previous grouping, whether between those supplied by the same sense only, or also in combination with those supplied by other senses.

Now, if this is so well known to be the case with percepts, obviously it must also be the case with recepts. If we thus find by experiment that all our perceptions are dependent on sub-conscious co-ordination wholly automatic, much more may we be prepared to find that the simplest of our ideas are dependent on spontaneous co-ordinations almost equally automatic. Accordingly, it requires but a slight analysis of our ordinary mental processes to prove that all our simpler ideas are group-arrangements, which have been formed as I say spontaneously, or without any of that intentionally comparing, sifting, and combining process which is required in the higher departments of ideational activity. The comparing, sifting, and combining is here done, as it were, for the conscious agent; not by him. Recepts are received: it is only concepts that require to be conceived. For a recept is that kind of idea the constituent parts of which—be they but the memories of percepts, or already more or less elaborated as recepts—unite spontaneously as soon as they are brought together. It matters not whether this readiness to unite is due to obvious similarity, or to frequent repetition: the point is that there is so strong an affinity between the elementary constituents, that the compound is formed as a consequence of their mere apposition in consciousness. If I am crossing a street and hear behind me a sudden shout, I do not require to wait in order to predicate to myself that there is probably a hansom cab just about to run me down: a cry of this kind, and in those circumstances, is so intimately associated in my mind with its purpose, that the idea which it arouses need not rise above the level of a recept; and the adaptive movements on my part which that idea immediately prompts, are performed without any intelligent reflection. Yet, on the other hand, they are neither reflex actions nor instinctive actions: they are what may be termed receptual actions, or actions depending on recepts.

This, of course, is an exceedingly simple illustration, and I have used it in order to make the further remark that actions depending on recepts, although they often thus lie near to reflex actions, are by no means bound to do so. On the contrary, as we shall immediately find, actions depending on recepts are often so highly “intelligent,” that in our own case it is impossible to draw the line between them and actions depending on concepts. That is to say, in our own case there is a large border-land where introspection is unable to determine whether adjustive action is due to recepts or to concepts; and hence it is only in the case of animals that we can be certain as to the limits of intelligent adjustment which are possible under the operation of recepts alone. The question therefore, now arises,—How far can this process of spontaneous or unintentional comparing, sifting, and combining go without the intentional co-operation of the conscious agent? To what level of ideation can recepts attain without the aid of concepts? We have seen in the last chapter that animals display generic or receptual ideas of Good-for-eating, Not-good-for-eating, &c.; and we know that in our own case we “instinctively” avoid placing our hands in a flame, without requiring to formulate any proposition upon the properties of flame. How far, then, can this kind of unnamed or non-conceptional ideation extend? Or, in other words, how far can mind travel without the vehicle of Language? For the reasons already given, I will answer this question by fastening attention exclusively on the mind of brutes.

To lead off with a few instances which have been already selected for substantially the same purpose by Mr. Darwin:—

“Houzeau relates that, while crossing a wide and arid plain in Texas, his two dogs suffered greatly from thirst, and that between thirty and forty times they rushed down the hollows to search for water. These hollows were not valleys, and there were no trees in them, or any other difference in the vegetation; and as they were absolutely dry, there could have been no smell of damp earth. The dogs behaved as if they knew that a dip in the ground offered them the best chance of finding water, and Houzeau has often witnessed the same behaviour in other animals.”

I have myself frequently observed this association of ideas between hollow ground and probability of finding water in the case of setter-dogs, which require much water while working; and it is evident that the ideas associated are of a character highly generic.

Further, Mr. Darwin writes:—“I have seen, as I dare say have others, that when a small object is thrown on the ground beyond the reach of one of the elephants in the Zoological Gardens, he blows through his trunk on the ground beyond the object, so that the current reflected on all sides may drive the object within his reach. Again, a well-known ethnologist, Mr. Westropp, informs me that he observed in Vienna a bear deliberately making with his paw a current in some water, which was close to the bars of his cage, so as to draw a piece of floating bread within his reach.”[38]

In Animal Intelligence it will be seen that both these observations are independently confirmed by letters which I have received from correspondents; so that the facts must be accepted. And they imply a faculty of forming generic ideas of a high order of complexity. Indeed, these are not unlike the generic ideas of intelligent water-dogs with reference to water-currents, which induce the animals to make allowance for the force of the current by running in the opposite direction to its flow before entering the water. Dogs accustomed to tidal rivers, or to swimming in the sea, acquire a still further generic idea of uncertainty as to the direction of the flow at any given time; and therefore some of the more intelligent of these dogs first ascertain the direction in which the tide is running by placing their fore-paws in the stream, and then proceed to make their allowance for driftway accordingly.[39]

Lastly, Mr. Darwin writes:—“When I say to my terrier in an eager voice (and I have made the trial many times), ‘Hi, hi, where is it?’ she at once takes it as a sign that something is to be hunted, and generally first looks quickly all around, and then rushes into the nearest thicket, to scout for any game, but finding nothing, she looks up into any neighbouring tree for a squirrel. Now, do not these actions clearly show that she had in her mind a general idea, or concept, that some animal is to be discovered and hunted?”[40]

From the many instances which I have already given in Animal Intelligence of the high receptual capabilities of ants, it will here be sufficient to re-state the following, which is quoted from Mr. Belt, whose competency as an observer no one can dispute.

“A nest was made near one of our tramways, and to get to the trees the ants had to cross the rails, over which the waggons were continually passing and re-passing. Every time they came along a number of ants were crushed to death. They persevered in crossing for some time, but at last set to work and tunnelled underneath each rail. One day, when the waggons were not running, I stopped up the tunnels with stones; but although great numbers carrying leaves were thus cut off from the nest, they would not cross the rails, but set to work making fresh tunnels underneath them.”

These facts cannot be ascribed to “instinct,” seeing that tram-cars could not have been objects of previous experience to the ancestors of the ants; and therefore the degree of receptual intelligence, or “practical inference,” which was displayed is highly remarkable. Clearly, the insects must have appreciated the nature of these repeated catastrophes, and correctly reasoned out the only way by which they could be avoided.

As this is an important branch of my subject, I will add a few more illustrations drawn from vertebrated animals, beginning with some from the writings of Leroy, who had more opportunity than most men of studying the habits of animals in a state of nature.[41]

He says of the wolf:—“When he scents a flock within its fold, memory recalls to him the impression of the shepherd and his dog, and balances that of the immediate neighbourhood of the sheep; he measures the height of the fence, compares it with his own strength, takes into account the additional difficulty of jumping it when burdened with his prey, and thence concludes the uselessness of the attempt. Yet he will seize one of a flock scattered over a field, under the very eyes of the shepherd, especially if there be a wood near enough to offer him a hope of shelter. He will resist the most tempting morsel when accompanied by this alarming accessory [the smell of man]; and even when it is divested of it, he is long in overcoming his suspicions. In this case the wolf can only have an abstract idea of danger—the precise nature of the trap laid for him being unknown.... Several nights are hardly sufficient to give him confidence. Though the cause of his suspicions may no longer exist, it is reproduced by memory, and the suspicion is unremoved. The idea of man is connected with that of an unknown danger, and makes him distrustful of the fairest appearances.”[42]

Leroy also well observes:—“Animals, like ourselves, are forced to make abstractions. A dog which has lost his master runs towards a group of men, by virtue of a general abstract idea, which represents to him the qualities possessed in common with these men by his master. He then experiences in succession several less general, but still abstract ideas of sensation, until he meets the particular sensation which he seeks.”[43]

Again, with regard to the stag, this author writes:—“He exhausts every variety and every design of which the action of flight consists. He has perceived that in thickets, where the passage of his body leaves a strong trace, the dogs follow him ardently, and without any checks; he therefore leaves the thicket and plunges into the forests where there is no underwood, or else skirts the high-road. Sometimes he leaves that part of the country altogether, and depends wholly on his speed for escape. But even when out of hearing of the dogs, he knows that they will soon come up with him; and, instead of giving himself up to false security, he avails himself of this respite to invent new artifices to throw them out. He takes a straight course, returns on his steps, and bounding from the earth many times consecutively, throws out the sagacity of the dogs.... When hard pressed he will often drop down in the hope that their ardour will carry them beyond the track, and should it do so he retraces his steps. Often he seeks the company of others of his species, and when his friend is sufficiently heated to share the peril with, he leaves him to his fate and escapes by rapid flight. Frequently the quarry is thus changed, and this artifice is one the success of which is most certain.”[44]

“Often (when not being hunted at all), instead of returning home in confidence and straightway lying down to rest, he will wander round the spot; he enters the wood, leaves it, goes and returns on his steps many times. Without having any immediate cause for his uneasiness, he employs the same artifices which he would have employed to throw out the dogs, if he were pursued by them. This foresight is an evidence of remembered facts, and of a series of ideas and suppositions resulting from those facts.”[45]

It is remarkable enough that an animal should seek to confuse its trail by such devices, even when it knows that the hounds are actually in pursuit; but it is still more so when the devices are resorted to in order to confuse imaginary hounds which may possibly be on the scent. Perhaps to some persons it may appear that such facts argue on the part of the animals which exhibit them some powers of representative thought, or some kind of reflection conducted without the aid of language. Be it remembered, therefore, I am not maintaining that they do not: I am merely conceding that the evidence is inadequate to justify the conclusion that they do; and all I am now concerned with is to make it certain that in animals there is a logic, be it a logic of recepts only, or likewise what I shall afterwards explain as a logic of pre-concepts.

Again, Leroy says of the fox:—“He smells the iron of the trap, and this sensation has become so terrible to him, that it prevails over every other. If he perceives that the snares become more numerous, he departs to seek a safe neighbourhood. But sometimes, grown bold by a nearer and oft-repeated examination, and guided by his unerring scent, he manages, without hurt to himself, to draw the bait adroitly out of the trap.... If all the outlets of his den are guarded by traps, the animal scents them, recognizes them, and will suffer the most acute hunger rather than attempt to pass them. I have known foxes keep their dens a whole fortnight, and only then make up their minds to come out because hunger left them no choice but as to the mode of death.... There is nothing he will not attempt in order to save himself. He will dig till he has worn away his claws to effect his exit by a fresh opening, and thus not unfrequently escapes the snares of the sportsman. If a rabbit imprisoned with him gets caught in one of the snares, or if by any other means one should go off, he infers that the machine has done its duty, and walks boldly and securely over it.”[46]

Lastly, this author gives the case, which has since been largely quoted—although its source is seldom given—of crows which it is desired to shoot upon their nests, in order to destroy birds and eggs at the same time. The crows will not return to their nests during daylight, if they see any one waiting to shoot them. If, to lull suspicion, a hut is made below the rookery and a man conceal himself in it with a gun, he waits in vain if the bird has ever before been shot at in a similar manner. “She knows that fire will issue from the cave into which she saw a man enter.” Leroy then goes on to say:—“To deceive this suspicious bird, the plan was hit upon of sending two men into the watch-house, one of whom passed on while the other remained; but the crow counted and kept her distance. The next day three went, and again she perceived that only two returned. In fine it was found necessary to send five or six men to the watch-house in order to put her out of her calculation.”

Now, as Leroy is not a random writer, and as his life’s work was that of Ranger at Versailles, we must not lightly set aside this statement as incredible, more especially as he adds that the “phenomenon is always to be repeated when the attempt is made,” and so is to be regarded as “among the very commonest instances of the sagacity of animals.”[47] If it is once granted that a bird has sagacity enough to infer that where she has observed two men pass in and only one come out, therefore the second man remains behind, it is only a matter of degree how far the differential perception may extend. Of course it would be absurd to suppose that the bird counts out the men by any process of notation, but we know that for simple ideas of number no symbolism in the way of figures is necessary. If we were to see three men pass into a building and only two come out, we should not require to calculate 3-2=1; the contrast between the simultaneous sense-perception of A+B+C, when receptually compared with the subsequently serial perceptions of A and B, would be sufficient for the spontaneous inference that C must still be in the building. And this process would in our own case continue possible up to the point at which the simultaneous perception was not composed of too many parts to be afterwards receptually analysed into its constituents.[48]

In this connection also I may state that, with the assistance of the keeper, I have succeeded in teaching the Chimpanzee now at the Zoological Gardens to count correctly as far as five. The method adopted is to ask her for one straw, two straws, three straws, four straws, or five straws—of course without observing any order in the succession of such requests. If more than one straw is asked for, the ape has been taught to hold the others in her mouth until the sum is completed, so that she may deliver all the straws simultaneously. For instance, if she is asked for four straws, she successively picks up three straws and puts them in her mouth: then she picks up the fourth, and hands over all the four together. This method prevents any possible error arising from her interpretation of vocal tones, which might well arise if each straw were asked for separately. Thus there can be no doubt that the animal is able to distinguish receptually between the numbers 1, 2, 3, 4, 5, and understands the name for each. Further than this I have not attempted to take her. I may add that her performance has been witnessed by the officers of the Zoological Society and also by other naturalists, who will be satisfied with the accuracy of the above account. But the ape is capricious, and, unless she happens to be in a favourable mood at the time, visitors must not be disappointed if they fail to be entertained by an exhibition of her learning.

The great physiologist MÜller and the great philosopher Hegel are quoted by Mr. Mivart as maintaining, that “to form abstract conceptions of such operations as of something common to many under the notion of cause and effect, is a perfect impossibility to them” (animals[49]); and no doubt many other illustrious names might be quoted in support of the same statement. But it seems to me that needless obscurity is imported into this matter, by not considering in what our own idea of causality consists. It is clear that to attain a general idea of causality as universal, &c., demands higher powers of abstract thought than are possessed by any animals, or even by the great majority of men; but it is no less clear that all men and most animals have a generic idea of causality, in the sense of expecting uniform experience under uniform conditions. A cat sees a man knock at the knocker of a door, and observes that the door is afterwards opened: remembering this, when she herself wants to get in at that door, she jumps at the knocker, and waits for the door to be opened.[50] Now, can it be denied that in this act of inference, or imitation, or whatever name we choose to call it, the cat perceives such an association between the knocking and the opening as to feel that the former as antecedent was in some way required to determine the latter as consequent? And what is this but such a perception of causal relation as is shown by a child who blows upon a watch to open the case—thinking this to be the cause of the opening from the uniform deception practised by its parent,—or of the savage who plants nails and gunpowder to make them grow? And endless illustrations of such a perception of causality might be drawn from the everyday life of civilized man: indeed, how seldom does any one of us wait to construct a general proposition about causality in the abstract before we act on our practical knowledge of it. And that this practical knowledge in the case of animals enables them to form a generic idea, or recept, of the equivalency between causes and effects—such that a perceived equivalency is recognized by them as an explanation—would appear to be rendered evident by the following fact, which I carefully observed for the express purpose of testing the question. I quote the incident from an already-published lecture, which was given before the British Association at Dublin, in 1878.

“I had a setter dog which was greatly afraid of thunder. One day a number of apples were being shot upon the wooden floor of an apple-room, and, as each bag of apples was shot, it produced through the rest of the house a noise resembling that of distant thunder. My dog became terror-stricken at the sound; but as soon as I brought him to the apple-room and showed him the true cause of the noise, he became again buoyant and cheerful as usual.”[51]

The importance of clearly perceiving that animals have a generic, as distinguished from an abstract, idea of causation—and, indeed, must have such an idea if they are in any way at all to adjust their actions to their circumstances—the importance of clearly perceiving this is, that it carries with it a proof of the logic of recepts being able to reach generic ideas of principles, as well as of objects, qualities, and actions. In order to prove this important fact still more unquestionably, I will here quote a passage from the biography of the cebus which I kept for the express purpose of observing his intelligence.

“To-day he obtained possession of a hearth-brush, one of the kind which has the handle screwed into the brush. He soon found the way to unscrew the handle, and, having done that, he immediately began to try to find out the way to screw it in again. This he in time accomplished. At first he put the wrong end of the handle into the hole, but turned it round and round the right way for screwing. Finding it did not hold, he turned the other end of the handle, carefully stuck it into the hole, and began again to turn it the right way. It was, of course, a very difficult feat for him to perform, for he required both his hands to hold the handle in the proper position, and to turn it between his hands in order to screw it in; and the long bristles of the brush prevented it from remaining steady, or with the right side up. He held the brush with his hind hands, but even so it was very difficult for him to get the first turn of the screw to fit into the thread; he worked at it, however, with the most unwearying perseverance until he got the first turn of the screw to catch, and he then quickly turned it round and round until it was screwed up to the end. The most remarkable thing was that, however often he was disappointed in the beginning, he never was induced to try turning the handle the wrong way; he always screwed it from right to left. As soon as he had accomplished his wish, he unscrewed it again, and then screwed it on again the second time rather more easily than the first, and so on many times.”

The above is extracted from the diary kept by my sister. I did not myself witness the progress of this research with the hearth-brush, as I did so many of the other investigations successfully pursued by that wonderful animal. But I have a perfect confidence in the accuracy of my sister’s observation, as well as in the fidelity of her account; and, moreover, the point with which I am about to be concerned has reference to what followed subsequently, as to which I had abundant opportunities for close and repeated observations. For the point is that, after having thus discovered the mechanical principle of the screw in that one particular case, the monkey forthwith proceeded to generalize, or to apply his newly gained knowledge to every other case where it was at all probable that the mechanical principle in question was to be met with. The consequence was that the animal became a nuisance in the house by incessantly unscrewing the tops of fire-irons, bell-handles, &c., &c., which he was by no means careful always to replace. Here, therefore, I think we have unquestionable evidence of intelligent recognition of a principle, which in the first instance was discovered by “the most unwearying perseverance” in the way of experiment, and afterwards sought for in multitudes of wholly dissimilar objects.[52]

To these numerous facts I will now add one other, which is sufficiently remarkable to deserve republication for its own sake. I quote the account from the journal Science, in which it appeared anonymously. But finding on inquiry that the observer was Mr. S. P. Langley, the well-known astronomer, and being personally assured by him that he is certain there is no mistake about the observation, I will now give the latter in his own words.

“The interesting description by Mr. Larkin (Science, No. 58) of the lifting by a spider of a large beetle to its nest, reminds me of quite another device by which I once saw a minute spider (hardly larger than the head of a pin) lift a house-fly, which must have been more than twenty times its weight, through a distance of over a foot. The fly dangled by a single strand from the cross-bar of a window-sash, and, when it first caught my attention, was being raised through successive small distances of something like a tenth of an inch each; the lifts following each other so fast, that the ascent seemed almost continuous. It was evident that the weight must have been quite beyond the spider’s power to stir by a ‘dead lift;’ but his motions were so quick, that at first it was difficult to see how this apparently impossible task was being accomplished. I shall have to resort to an illustration to explain it; for the complexity of the scheme seems to belong less to what we ordinarily call instinct than to intelligence, and that in a degree we cannot all boast ourselves.