. The Americana : a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc. of the world . ger meteoric masseswhich constitute the head of the comet is not atfirst sight obvious. If, however, we consider thematter carefully, we shall see that if all objectsare attracted to the sun in proportion to theirmass, and repelled from it in proportion to theirsurface, then the attraction will vary as thecube of the diameter of the objects and the re-pulsion as the square. For objects of ordinarysize the repulsion is so slight that we cann
. The Americana : a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc. of the world . ger meteoric masseswhich constitute the head of the comet is not atfirst sight obvious. If, however, we consider thematter carefully, we shall see that if all objectsare attracted to the sun in proportion to theirmass, and repelled from it in proportion to theirsurface, then the attraction will vary as thecube of the diameter of the objects and the re-pulsion as the square. For objects of ordinarysize the repulsion is so slight that we cannot de-tect it; but if the object becomes graduallysmaller, the attraction of the mass will diminishmuch more rapidly than the repulsion on thesurface, and a time will come when they will beequal, and if the particle becomes still smaller,the repulsion must exceed the attractive therefore becomes evident that if such a re-pulsive force existed, and if the gaseous mole-cules were sufficiently small, we should have aneffect exactly like that which we observe. It has been shown by J. J. Thomson (Pro-ceeding of the Royal Society, LVTTT. No. 350). THE COMET OF 1882 COMET that if hydrogen gas is electrified positively, thegreen line in its spectrum will be brighter thanthe red, and, on the other hand, if negativelycharged, the red will be brighter than the the case of the sun the red is the brighterline, so that we may infer that the solar surfaceis charged negatively. It is a well-known fact that if the ultra-violet rays of the spectrum be allowed to fallupon a metallic body little corpuscles or electronsleave the atoms forming the metallic body andfly away from them with enormous corpuscles either carry a negative chargeof electricity, or what is perhaps more probable,constitute the negative electricity itself. Theatoms lacking these corpuscles are as we usuallyexpress it positively charged. Surrounding the meteor swarm and with itforming the comets
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