1825 In Science

Astronomy

• Pierre-Simon Laplace completes his study of gravitation, the stability of the solar system, tides, the precession of the equinoxes, the libration of the Moon, and Saturn's rings in Mecanique Celeste

Chemistry

• Michael Faraday isolates benzene
• Hans Christian rsted produces metallic aluminium in an impure form

Mathematics

• Augustin-Louis Cauchy presents the Cauchy integral theorem for general integration paths -- he assumes the function being integrated has a continuous derivative
• Augustin-Louis Cauchy introduces the theory of residues in complex analysis
• Johann Peter Gustav Lejeune Dirichlet and Adrien-Marie Legendre prove Fermat's last theorem for n = 5
• Andr-Marie Ampre discovers Stokes' theorem

Paleontology

• Georges Cuvier proposes his catastrophe theory as the cause of extinctions of large groups of animals
• Etienne Geoffroy Saint-Hilaire identifies Cuvier's fossil `crocodile as a teleosaurus

Technology

• September 27th - The world's first modern railway, the Stockton and Darlington Railway, opens

Awards

• Copley Medal: Franois Arago; Peter Barlow

Births

• May 4 - Sir Thomas Henry Huxley (d. 1895), English biologist.

Deaths

• October 6 - Bernard Germain Etienne (b. 1756), naturalist.

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