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(1) A theory of the rate of solution of solid into liquid was proposed, which is based upon the assumptions that among the molecules, which compose the solid surface, only those, whose components of energies of vibration at right angles to the interface are greater than a threshold value ε0, can enter into the liquid phase, and that among the molecules in the liquid phase, only those, which collide with the interface with velocities, whose components at right angles to the interface are greater than a threshold value u0, can condense on the solid surface. According to this theory the rate of solution is expressed by (Remark: Graphics omitted.) \oindentwhich can be transformed into the following equation. (Remark: Graphics omitted.) (2) According to the present theory the solubility of solid is given by (Remark: Graphics omitted.) \oindentor (Remark: Graphics omitted.) (3) The experimental facts obtained by a number of writers have been interpreted in the light of the present theory.

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