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This investigation is an attempt to determine the effect of a number of factors upon the velocity of crystallization (V. C.) of substances from supersaturated solutions in the hope that the results will throw some light upon the mechanism of this very important phenomenon.The question of the order of reaction of the crystallization process has provoked considerable discussion. The equation of Noyes and Whitney3,4 for the velocity of solution of crystals in a solvent of the first order is 57where K is the so-called velocity constant, 5 is the surface area of the crystal or crystals, Cs is the concentration of the saturated solution, and C is the concentration of the solution at any time t. If the processes of solution 1 The work included in this paper is from the thesis presented by John D, Jenkins in partial fulfilment of the requirements for the degree of Doctor of Philosophy at the University of Wisconsin. This investigation was conducted under the supervision of Professor J. H. Walton.

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