76 Dr. S. J. Plimpton on the Recombination of 



which involves the number of ions initially present, but to 

 modify the formula in the following manner : — 



_ <©. 



OL = 



dt 



In this way the determinations of a are rendered independent 

 of the initial conditions. 



Fiff. 5. 



.01 T 



SOz. 3T MM 

 C2H5CI I00 MM 



AIR 41!"" 



COz 382' 



S 02 355'"^ 

 C02. 760 M1 * 



AIR tG8^^ 



rCzHsBR 28' 

 :air t60 mm 



SO2 ioo~ ,M 



In fig. 5 the reciprocals of the deflexions are plotted for 

 the various time intervals. The slope of these curves should 

 be proportional to a. 



