Abstract

IN connection with the subject of water of hydration the results of Van Bemmelen, described in the Berliner Berichle, are of interest. He has determined the quantities of water parted with, and also taken up by various hydrated oxides under different conditions of temperature and humidity of surrounding atmosphere. The results afford another instance of the graduation of chemical into physical actions. The amount of water taken up varies but little, but the strength of the combination varies much. The formation of hydrates appears to be a function of molecular weight of the oxide and of the temperature.

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