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464. ; 1734, pp. 341, 40 Electric He and Magnetic found, in fact, that electrified when Science gold-leaf which had been by contact with excited glass was brought near to an excited piece of copal,* an attraction was manifested between " " I had expected," he writes, them. " repelled Proceeding with his experiments he found that the gold-leaf, when and repelled by glass, was attracted by all electrified resinous substances, and that when repelled by the " latter it was attracted by the glass.

1663), who had given to the phein straight lines, but that there is nomenon the name diffraction. Hooke's theoretical investigations on light were of great importance, representing as they do the transition from the Cartesian system to the fully developed theory of undulations. He begins by attacking Descartes' proposition, that light is a " There is," tendency to motion rather than an actual motion. g. the diamond when rubbed or heated in the dark) shine for a considerable time without being ; is in motion is not perand that the motion must therefore manently body, be of a to-and-fro or vibratory character.

Descartes' theory therefore held the field until the publication in 1667 of the Micrographics * written at Toulouse in August, 1657, to Monsieur de la reprinted in (Euvres de Fermat (ed. 1891), ii, p. 354. t That reflected light follows the shortest path was no new result, for it had Epist. cua rwv OTTTIKUHT of Heliodorns of Larissa, a work of which several editions were published in the seventeenth, century. written at Toulouse on Jan. J Epist. XLIII, Fermat, ii, p. 457 ; i, The imprimatur 1, 1662 ; reprinted in (Euvres de pp.

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