As 18,000,000, out of the 20,000,000, of telescopic stars lie in the Milky-way, it is not by any means improbable that such a conjunction of stars may occur therein as often at least as once or twice in a century. We certainly see brilliant patches of closely-crowded stars, in great numbers, in this galactic zone, and the fact that these temporary stars almost uniformly appear in that zone renders the suggestion here made quite as rational, in the way of speculation at least, as that of "vapory celestial matter" suddenly condensed into a star of the first magnitude, as Sir. William Herschel would have us believe was possible, if not probable. Besides, it is a definitely ascertained fact that such clusters of stars, lying in almost the same line of vision, exist in various parts of the heavens, which present to the naked eye the appearance of a star of the fourth or fifth magnitude, and probably would, if more thickly clustered, present that of a star of the first magnitude. But powerful telescopes resolve them into a large number of stars, from the thirteenth to the fifteenth magnitude. One such cluster in Andromeda's girdle has been resolved into not less than fifteen hundred small stars of very low magnitude, and pretty widely scattered in the telescopic field. Alexander Von Humboldt, in speaking of stars that have thus disappeared, says that "their disappearance may be the result of their motion as much as of any diminution of their photometric processes (whether on their surfaces or in their photospheres), as would render the waves of light too weak too excite the organs of sight." And he adds: "What we no longer see is not necessarily annihilation," repeating at the same time the question of Pliny--"_Stellæ an obirent nascerenturve?_"