AT this time of stress and anxiety we all, however steadfast in giving our service to the great task in which our country is engaged, must, from time to time, seek intervals of release from the torrent of thoughts which is set going by the tremendous fact that we are fighting for our existence. To very many relief comes in splendid self-sacrificing action, in the joyful exercise of youthful strength and vigour for a noble cause. But even these, as well as those who are less fortunate, need intervals of diversion—brief change of thought and mental occupation—after which they may return to their great duties rested and refreshed.

I know that there are many who find a never-failing source of happiness in acquaintance with things belonging to that vast area of Nature which is beyond and apart from human misery, an area unseen and unsuspected by most of us and yet teeming with things of exquisite beauty; an area capable of yielding to man knowledge of inestimable value. Many are apt to think that the value of "Science" is to be measured mainly, if not exclusively, by the actual power which it has conferred on man—mechanical and electrical devices, explosives, life-saving control over disease. They would say of Science, as the ignoble proverb tells us of Honesty, that it is "the best policy." But Honesty is far more than that, and so is Science. Science has revealed to man his own origin and history, and his place in this world of un-ending marvels and beauty. It has given him a new and unassailable outlook on all things both great and small. Science commends itself to us as does Honesty and as does great Art and all fine thought and deed—not as a policy yielding material profits, but because it satisfies man's soul.

I offer these chapters to the reader as possibly affording to him, as their revision has to me, a welcome escape, when health demands it, from the immense and inexorable obsession of warfare. The several chapters have been selected from articles entitled "Science from an Easy Chair" written in recent years by me for the "Daily Telegraph." Under that title I have already published two volumes of similar selections. I have chosen a new title, "Diversions of a Naturalist," for this third volume in order to avoid confusion with the earlier ones. Illustrative drawings have been introduced into several of the articles and a few alterations made in the text. But they remain essentially what their origin implies—namely, detached essays addressed to a wide public.

I wish to thank my friend Dr. Smith Woodward of the Natural History Museum for the figures 23, 25, 26, 27, 28, 29, and 30, illustrating Chapter X, and also to thank Messrs. Veitch for the use of figures 33, 34, 35, 40, and 42. I have copied figures 4 to 8, 11, 19, and 20 from the drawings made by Philip Henry Gosse, F.R.S., and published by him in that wonderful little book "Marine Zoology," now long out of print. I have also borrowed my frontispiece from the book on "The Aquarium" by that great naturalist and lover of the seashore. Many beautiful coloured plates of marine animals executed by his skilful hand are to be found in that and other works published by him.

E. R. L.

16 June 1915

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