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From a D. 1812 to 1848

Astronomy.

Physics and Mechanics.

Chemistry.

Physical Geography Biology. and Geology. 1812. Former 1812. Cuvier reperiods of life on the globe proved by Cuvier. stores the fossil animals of Paris. 1815. Davy's safetylamp. 1815. W. Smith's geological map. 1816. Fresnel and Young, polarization of light. 1817. Buckland's 1817. Cuvier's geological lec- "Animal Kingtures. dom" published. 1818. Berzelius on 1818. G. St.-Hi- 1819.

Encke's use of the blowlaire on unity of Comet. 1819. Oersted, pipe. plan in animals. electro - magnetism. 1820-1838. Sir J.

Sir J. 1820.

Ampère, electro-magnet- Herschel studies stars of the south- ism. ern hemisphere; 1821. Faraday, elec- Magellanic clouds. tro-magnetism. 1822. Seebeck on Herschel thermo-electricity. on use of spec- 1826-60. Schwabe 1826. Nobili provestroscope to deproves periodicity the truth of animal tect chemical eleof sun-spots. 1826. Biela's comet. electricity ments. 1823. Liquefac- Faraday.

McEnery discovers flint tools, with bones mals, in Kent's Cavern. of extinct ani- 1828. Von Baer's law of embryological develop- 1838. Herschel's "Outlines of Astronomy" published. 1837.

Wheatstone and Cooke electric telegraph. 1839-42. Séguin and Mayer on relation between heat and work. 1839. Daguerreotypes. tion of gases by ment. 1830. Liebig's 1830. Lyell's "Geoanalyses of orlogy;" he insists ganic substan- on sufficiency of ces. 1832. Discovery of chloroform and chlorale by Liebig. 1834. Faraday on electrolysis; chemical nature of electric current; invention of voltameter. causes like the present to explain the past history of the globe.

Robert Brown, Moldenhauer, Mirbel, and others on structural and physiological botany. 1832. Death of Cuvier. 1835. Sir W.

Hooker, and foundation of Kew Gardens. 1839. Agassiz on freshwater fishes. 1840. Agassiz on 1840-48. Organic glacial period and chemistry. blocks carried over Europe by ice.