not only
the history of the discoveries in astronomy, but is also a complete
text-book of astronomy as understood at this period.

Falconer, Hugh. See vol. iii., p. 99.

In Paloontological Memoirs, vol. ii., pp. 596-598. 252

Herschbl, William. See vol. iii., p. 20 ff.

On the Proper Motion of the Solar System, Phil. Trans., vol. 73, for
1783. (This paper was read in March, 1783.) The Constitution of the
Heavens, Phil. Trans, for 1785, vol. 75, p. 213. Howard, Luke. See vol.
iii., p. 182.

Philosophical Magazine, 1803. Humboldt, Alexander von. See vol. iii., p.
192.

Des lignes isothermes et de la distribution de la chaleur sur le globe,
published in vol. iii., of Memoires de physique et de chimie de la
Societe d'Arcueil, Paris, 1819. Hutton, James. See vol. iii., p. 178.

Theory of Rain, in Transactions of the Royal Society of Edinburgh, 1788,
vol. i., pp. 53-56. See vol. iii., p. 121. From Transactions of the
Royal Society of Edinburgh, 1788, vol. i., pp. 214-304. A paper on the
"Theory of the Earth," read before the society in 1781.

Kant, Immanuel (i724-1804). See vol. iii., p. 27.

Allgemeine Naturgeschichte und Theorie des Himmels, 1755. Cosmogony, ed.
and trans, by W. Hartie, D.D., Glasgow, 1900.

Laplace, M. le Marquis de. See vol. iii., p. 32.

Exposition du systeme du monde, Paris, 1796, is available in Ouvres
completes, in 12 vols., Paris, 1825-1833^01. vi., p. 498. Lyell,
Charles. See vol. iii., p. 88.

Principles of Geology, 4 vols., London, 1834.

Marsh, O. C. See vol. Hi., p. 107.

Fossil Horses in America (reprinted from American Naturalist, vol.
viii., May, 1874), pp. 288, 289.

Playpair, John. See vol. iii., pp. 131, 165.

Illustrations of the Huttonian Theory, 1802.

Scrope, G. Poulett. See vol. iii., p. 132.

Consideration of Volcanoes, London, 1823, pp. 228-234.

Wells, W. C. See vol. iii., p. 185. Essay on Dew, London, 1818.

IV.--MODERN PHYSICAL AND CHEMICAL SCIENCES

Black, Joseph. See vol. iv., p. 12.

De acido e cibis orlo, et de magnesia, reprinted at Edinburgh, 1854. In
this he sketched his discovery of carbonic acid. Later this paper
was incorporated in his Experiments on Magnesia, Quicklime, and Other
Alkaltne Substances.

Bunsen, William. See vol. iv., p. 69.

Cavendish, Henry. See vol. iv., p. 15.

"Experiments on Air," in Phil. Trans., 1784, p. 119. This paper contains
Cavendish's discovery of the composition of water and of nitric acid.

Daguerre