WALLACE O. FENN 



473 



3 Hours 



Fig. 3. Curves showing the rates of ingestion of 3.2/x and 4.7^ carbon particles. 

 The logarithms of the number of particles not ingested are plotted (ordinates) 

 against time (abscissae). All three concentrations (4, 3, and 2) of the 3.2ju particles 



give K = 0.38 approximately. Experimental initial ratio 



K^.-j^ 



0.63; theoreti- 



cal ratio is 0.58. This ratio increases with time due to the decrease in K^.Ty. as 

 predicted. 



