  - Acoustics cultivated by Pythagoras and Aristotle, page 248.
- Æpinus, his laws of equilibrium of electricity, 332.
- AËriform fluids, liquids kept in a state of vapour, 321.
- Agricola, George, his knowledge of mineralogy and metallurgy, 112.
- Air, compressibility and elasticity of; limitation to the repulsive tendency of, 226.
- Weight of, unknown to the ancients, 228.
- First perceived by Galileo, 228.
- Proved by a crucial instance, 229.
- Equilibrium of, established, 231.
- Dilatation of, by heat, 319.
- Air-pump, discovery of, 230.
- Airy, his experiments in Dolcoath mine, 187.
- Alchemists, advantages derived from, 11.
- Algebra, 19.
- Ampere, his electro-dynamic theory, 202.
- Utility of, 203, 324.
- Analysis of force, 86.
- Of motion, 87.
- Of complex phenomena, 88.
- Anaxagoras, philosophy of, 107.
- Animal electricity, 337.
- Arago, M., his experiment with a magnetic needle and a plate of copper, 157.
- Archimedes, his practical application of science, 72.
- His knowledge of hydrostatics, 231.
- Arfwedson, his discovery of lithia, 158.
- Aristotle, his knowledge of natural history, 109.
- His works condemned, and subsequently studied with avidity, 111.
- His philosophy overturned by the discoveries of Copernicus, Kepler, and Galileo, 113.
- Arithmetic, 19.
- Art, empirical and scientific, differences between, 71.
- Remarks on the language, terms, or signs, used in treating of it, 70.
- Assurances, life, utility and abuses of, 58.
- Astronomy, cause of the slow progress of our knowledge of, 78.
- Theory and practical observations distinct in, 132.
- An extensive acquaintance with science and every branch of knowledge necessary to make a perfect observer in, 132.
- Five primary planets added to our system, 274.
- Positions, figures, and dimensions of all the planetary orbits now well known, 275.
- Atomic theory, 305.
- Advantage of, 306.
- Atomic weights of chemical elements, 306.
- Attraction, capillary, or capillarity, investigated by Laplace and Young, 234.
- Bacon, celebrated in England for his knowledge of science, 72.
- Benefits conferred on Natural Philosophy by him, 104.
- His Novum Organum, 105.
- His reform in philosophy proves the paramount importance of induction, 114.
- His prerogative of facts, 181.
- Illustrated by the fracture of a crystallized substance, 183.
- His collective instances, 184.
- Importance of, 105.
- Their general character, 106.
- Philosophy of, 108.
- Grimaldi, a jesuit of Bologna, his discovery of diffraction, or inflection of light, 252.
- Guinea and feather experiment, 168.
- Gunpowder, invention of, 55.
- A mechanical agent, 62.
- Haarlem lake, draining of, 61.
- Harmony, sense of, 248.
- Head, captain, anecdote of, 84.
- Heat, 193.
- Radiation and conduction of, 205.
- One of the chief agents in chemistry, 310.
- Our ignorance of the nature of, 310.
- Abuse of the sense of the term, 311.
- The general heads under which it is studied, 312.
- Its most obvious sources, 312.
- Animal heat, to what process referable, 313.
- Radiation and conduction of, 314.
- Solar heat differs from terrestrial fires, or hot bodies, 315.
- Principal effects of, 317.
- The antagonist to mutual attraction, 322.
- Latent heat, 322.
- Specific heat, 323.
- Herschel, sir William, his analysis of a solar beam, 314.
- Hipparchus, his catalogue of stars, 276.
- Holland drained of water by windmills, 61.
- Hooke almost the rival of Newton, 116.
- Huel Towan, steam-engine at, 59.
- Huyghens, his doctrine of light, 207.
- Ascertains the laws of double refraction, 254.
- Hydrostatics, first step towards a knowledge of, made by Archimedes, 231.
- Law of the equal pressure of liquids, 232.
- General applicability of, 232.
- Hypothesis, not to be deterred from framing them, 196.
- Conditions on which they should be framed, 197.
- Illustrated by the laws of gravitation, 198.
- Use and abuse of, 204.
- Induction, different ways of carrying it on, 102.
- Steps by which it is arrived at on a legitimate and extensive scale, 118.
- First stage of, 144.
- Verification of, 164.
- Instanced in astronomy, 166.
- Must be followed into all its consequences, and applied to all those cases which seem even remotely to bear upon the subject of enquiry, 173.
- Nature of the inductions by which quantitative laws are arrived at, 176.
- Necessity of induction embracing a series of cases which absolutely include the whole scale of variation of which the quantities in question admit, 177.
- Induced electricity, 333.
- Inertia, 223.
- Iodine, discovery of, 50.
- Efficacy of, in curing goÎtre, 51.
- Isomorphism, law of, 170.
- Kepler, effect of
4897-h@54897-h-15.htm.html#Page_300" class="pginternal">300.
- Physical data, necessity of, 209.
- Great importance of, 211.
- Illustrated by the erection of observatories, 213.
- Necessity of an exact knowledge of, 214.
- More precise than the observations by which we acquire them, 215.
- Physics, axioms of; analysis of, 102.
- Planets, circumjovial, 186.
- Platina, discovery of, 308.
- Pliny, his knowledge of quartz and diamond, 239.
- Pneumatics, 228.
- Political economy, 73.
- Prejudices of opinion and sense, 80.
- Conditions on which such are injurious, 81.
- Illustrated by the division of the rays of light, by the moon at the horizon, and by ventriloquism, 82.
- By the transition of the hand from heat to cold, 83.
- Prevost, M., his theory of heat, 316.
- His theory of reciprocal interchanges, a proof of the radiation of cold, 318.
- Printing, the art of, 193.
- Performed by steam, 194.
- Probabilities, doctrine of, 217.
- Illustrated by shooting at a wafer, 218.
- Prout, Dr., his opinion of the atomic weights, 307.
- Pyrometry, 319.
- Pythagoras, philosophy of, 107.
- Quinine, sulphate of, comparative comfort and health resulting from the use of, 56.
- Radiation of heat, laws of, 205.
- Repulsion in fluids and solids, 227.
- Rules, general, for guiding and facilitating our search among a great mass of assembled facts, 151.
- Rumford, count, experiments of, on gunpowder, 62.
- Savart, M., his experiments on solids, 243.
- His researches on sound, 249.
- Science, abstract, a preparation for the study of physics, 19.
- Not indispensable to the study of physical laws, 25.
- Instances illustrative of, 27.
- Science, physical, nature and objects, immediate and collateral, as regarded in itself and in its application to the practical purposes of life, and its influence on society, 35.
- State of, previous to the age of Galileo and Bacon, 104.
- Causes of the rapid advance of, compared with the progress at an earlier period, 347.
- Science, natural, cause and effect, the ultimate relations of, 76.
- Sciences and Arts, remarks on the language, terms, or signs used in treating of them, 70.
- Receive an impulse by the Baconian philosophy, 114.
- Sensation, cause of, 91.
- Senses, inadequate to give us direct information for the exact comparison of quantity, 124.
- Substitutes for the inefficiency of, 125.
- Seringapatam, method of breaking blocks from the quarries of, 47.
- Shells found in rocks at a great height above the sea, supposed cause of, 145.
- Smeaton, his experiments on bodies dilated by heat, 319.
- Solids, transparent, exhibit periodical colours when exposed to polarized light, 99.
- Influence of, on the Mind, THE END.
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