In this paper the corrections due to the introduction of the dynamic theory are first applied.

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Chap. VIII. for a summary of thermodynamic and applied theory of the steam-engine; Chap. VII., Vol. II., for the ultimate commercial outcome of ' theory and art, conspiring.'' On a Method of Planning Researches involvvenient, perfect and inexpensive method; ing Three Dimensions,' T~ansactions of the American Association for the Advancement of " ' Graphic Diagrams and Glyptic Models '; R. Science, 1877.

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tive to minutes instead-of seconds, now becomes K = 26A Unoe/ C. For if the velocity of the ions produced by phosphorus is like that of other gaseous ions, U is of the order (say) of 1 cm. /sec (Rutherford, Townsend, Chattock) and e of the order of 7 x 10-1°e lectrostatic units or 2.4 x 10-l' coulombs. The ratio of areas in my condenser was .35, the area A = 132 cm2., the capacity C about 90 cm. or 10-1 farads. Finally the observed value of K as used in computing the above curve was K= .634. Thus the initial saturation no = .634 x 10-10/26 x