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I. I~T~ODUCTIOZ~. I N the first part of this communication T a method of studying the rate of solution of air by water was described, and some results were given, which showed that, when the water was kept thoroughly mixed and the waterair surface unbroken, the phenomenon took place in accordance with the general equation dw z w in which a represents the initial rate of solution, and bw the rate of escape of the gas from the water, b being a constant depending on the conditions of the experiment. The method of experimenting consisted in enclosing a large bubble of air, of known volume, in a narrow tube containing de-aerated water, and allowing the bubble to pass

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