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Progress of Modern Science From A.d. 1674 to 1729

Astronomy.

Physics and Mechanics. 1676. Halley ob- 1676. Roemer serves transit of measures velo- Mercury. city of light. 1676. Noble and Pigot on stretched strings. 1682. Newton 1678. Huyghens Chemistry.

Physical Geography and Geology.

Biology. 1674. Malpighi on structure of plants. 1677. Leeuwenhoeck discovers animalcules. 1682. Picart 1682. Grew on strucmeasures the ture of plants. works out and proposes undupublishes the law of gravitalatory theory of light; law of size of the earth. tion. double refrac- 1682. Halley foretion. tells the return of a comet. 1687. Newton's 1687. Newton "Principia" pub- on propagation lished. 1691. Halley's method of measuring the sun's distance by the transit of Venus. of sound. 1690. Papin's heat-engine. 1690.

Rivinus proposes to give two names to each plant. 1693. Ray and Willughby's classification of animals; Ray's system of plants. 1694. Tournefort's system of plants. 1722. Graham on shifting of magnetic needle. 1727. Bradley on 1698. Savery's heat-engine. 1700. Sauveur on musical vibrations.

Bernoulli, Euler, 1701. Boerhaave Lagrangeon founder of ormusical strings. ganic chemistry. 1705. Newcomen's engine. 1718. Hales' exnutation and 1729. aberration. periments on gases. 1695. Woodward on fossils and succession of formations in 1707. Buffon and Lin- England. næus born.

C. More 1729. Stahl founds a system of chemistry on the theory of phlogiston.

Hall on dispersion of light in flint and crown glass. 1732. Du Faye on electricity. 1727. Hales on respiration of plants and formation of sap.

Astronomy. 1738. Bougier