As to the

Hermes Kelly Bags function of nuclei anil the inner sides of the flasks in Hermes Birkin 35CM Hermes bags determining crystallization, he regards Hermes Belt it Hermes Bags Outlet as the effect of one of those mysterious contact actions known as catalytic, of which Hermes Birkin 30CM science has not yet been able to give a satisfactory explanation. Bodies that appear to be active in inducing crystallization are designated as catalytic or dynamic, while bodies that arc apparently inactive are termed non-catalytic or adynamic. " It appears certain," he says, " that but Hermes Evelyne Bags for the mysterious action which Hermes handbags the air and Hermes Jewelry other bodies exert on supersaturated solutions, we should obtain sulphate of soda only in the modified state that is, crystallized with seven equivalents of water, aud possessing at ordinary temperatures of the air a much greater solubility than that of the normal 10-atom salt." Later inquirers have endeavoured Hermes Lindy Bags to explain the nature of the force exerted by nuclei in inducing crystallization under certain condition?, and their passivity under others. Gernez tried no less than 220 solids, and of these he selected 39 that were active in inducing Hermes outlet crystallization 18 were insoluble these were carefully washed in distilled Hermes Birkin 40CM water, and dried out of contact with air.

When dry they were Hermes Lindy Bags found to be without action on the solutions they Hermes Jewelry had previously Hermes Wallets caused to crystallize. Hermes outlet The 21 soluble substances were purified by rccrystallization, and they all became inactive. Hence it is concluded that sulphate of soda is the Hermes handbags only nucleus for solutions of the same salt. That is to say, whenever a glass rod or other body Hermes Evelyne Bags acts as Hermes Birkin 35CM Hermes Wallets a nucleus, it is Hermes Kelly 32CM contaminated with minute portions of the salt itself, Hermes Kelly 35CM which M. Gernez believes to exist in the air, not only of towns, but in the country. According to this view, the supersaturated Hermes Birkin 40CM solution of any other salt can only be Hermes Kelly 32CM crystallized by a saline Hermes bags nucleus of its own kind. But, as M. Jeannelf has pointed out, if this theory be true, we must have floating in the air specimens of all Hermes Bags Outlet kinds of salts that form supersaturated Hermes Kelly 35CM solutions, and crystallize by the Hermes Birkin introduction of a solid Hermes Belt nucleus whereas there are some such salts which cannot exist in the presence of the oxygen or of the ammonia of the air. M.

Jeannel shows that a few drops of Hermes Birkin 30CM an ordinary solution of a salt will induce crystallization in a supersaturated solution of the same salt without contact of air. 3. On the Actien of Nuclei. With respect to the action of nuclei on Hermes Birkin Hermes Birkin Bags saline supersaturated solutions generally, the author refers to a theory of his % which seems to account for the liberation of gases from their supersaturated solutions soda-water, seltzer-water, champagne, c when a solid nucleus that had been exposed to Hermes Birkin Bags the air is immersed in Hermes Kelly Bags them while such nucleus becomes inactive if kept long in water, or passed through flame c, and dried or cooled out of contact with air. The action of nuclei is referred to adhesion. Nuclei are active in inducing crystallization, Compfes Rcndus, vol.