Abstract
This memoir is divided into six parts. The first part contains a definition of the subject; the second an historical sketch; the third is on the action of nuclei in inducing crystallization, and the effect of low temperatures on a number of supersaturated solutions contained in chemically clean vessels; the fourth is on the formation of a modified salt, as in the case of zinco-sulphate and sodic sulphate; the fifth contains an inquiry as to whether anhydrous salts form supersaturated solutions; and the sixth and last part is a summary with a classified list of the salts examined 1. Definition .—When water at a high temperature is saturated with a salt, and, on being left to cool in a closed vessel, retains in solution a larger quantity of the salt than it could take up at the reduced temperature, the solutionis said to be supersaturated.

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