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Progress of Modern Science From a D. 1609 to 1642

1609.

Astronomy.

Physics and Mechanics.

Galileo dis- 1609. Invention of covers secondary the telescope, Gallight of the moon, ileos telescope. Jupiter's moons; phases of Venus. 1609. Kepler's two first laws. 1611. Galileo ob- 1611. Kepler's teleserves sun-spots and proves rotation 1615. of sun on its axis. 1618. Kepler's third law. scope.

Solomon Caus' engine.

Chemistry.

Physical Geography Biology. and Geology. 1619. Harvey discovers circulation of the blood. 1628. Kepler completes Rudolphine tables, and foretells transits of Venus and Mercury. 1631. Gassendi observes transit of Mercury. 1632. Galileo's system of the world; 1620 Drebbel alcohol thermometer. 1620. Bacon's "Novum Organum,"; Bacon suggests that heat may be a movement. 1621. Snellius discovers law of re- 1624. Van Helfraction. 1625. De Dominis explains the rainbow. his recantation. 1637. Descartes on mont introduces the term gas. 1622. Asellius discovers lacteals. 1639. Horrocks oblight and refracserves transit of tion.

Venus. 1642. Death of Galileo and birth of Newton.