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Even the undulatory hypothesis does not account for all the phenomena of light. The natural colors of objects, the compound nature of the solar ray, the absorption of light, and its chemical and vital action, the hypothesis leaves as mysterious as it found them; and some of these facts are, at least apparently, more reconcilable with the emission theory than with that of Young and Fresnel.
In fact, Brother Boche was quite plaintive about the matter. He described the employment of such engines as wicked and brutal, and opposed to the recognised usages of warfare. "Let us at least fight like gentlemen," said the Hun, with simple dignity. "Let us stick to legitimate military devices the murder of women and children, and the emission of chlorine gas. But Tanks no!
On the lower surface and there only, it sheds a soft, white gleam, similar to that of the glowworm. It lights up to celebrate its nuptials and the emission of its spores. There is no question of chemist's phosphorus here. This is a slow combustion, a sort of more active respiration than usual.
He was never able to get an automatic emission in this way, though he often tried, not even by walking briskly during an erection. In another class of cases a purely ideal symbolism may be present by means of a fetich which acts as a powerful stimulus without itself being felt to possess any attraction.
In this form it is equally characteristic of chemical composition with the "direct" spectrum, being due to absorption, as the latter is to emission. And absorption and emission are, by Kirchhoff's law, strictly correlative. This is easily understood by the analogy of sound.
Burchard elicited the history that the man had suffered from nocturnal emissions and erotic dreams of the most lascivious nature, sometimes having three in one night. During the day he would have eight or ten erections, unaccompanied by any voluptuous emotions. In these there would rarely be any emission, but occasionally a small mucous discharge.
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