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G. the metals, become luminous when they- -are heated, he inferred that every substance possesses a natural store of corpuscles, which are expelled when it is heated to conversely, corpuscles may become united to a material body as happens, for instance, when the body is exposed to the rays of a fire. Moreover, since the heat thus acquired is incandescence ; ; readily conducted throughout the substance of the body, he concluded that corpuscles can penetrate hard and dense they Let us here all substances, however be.

D 2 36 Electric and Magnetic proved that the temperature influence on its weight. of a Science body is without sensible Perhaps nothing in the history of natural philosophy is more amazing than the vicissitudes of the theory of heat. The true hypothesis, after having met with general acceptance throughout a century, and having been approved by a succession of illustrious men, was deliberately abandoned by their successors utterly false, and, in some of its and absurd. developments, grotesque We must now return to s'Gravesande's book.

In accordance with his earliest discovery, Newton considered colour to be an inherent characteristic of light, and inferred that must be associated with some it definite quality of the The corpuscles corresponding corpuscles or aether-vibrations. "* make several This sentence is the first enunciation of the great principle that homogeneous light is essentially periodic in its nature, and that differences of period correspond to differences of colour. The analogy with Sound is obvious and it may be remarked ; Newton's theory of periodic vibrations in an elastic medium, which he developed!

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A History of the Theories of Aether and Electricity -From The Age of Descart by Edmund T Whittaker

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