528 GROWTH 



Table 5. Division Rates of Protozoa with Constant Conditions 



Divisions per day, per organism. 



t From Darby (1930a). 



rate may be obscured by incorrect histogram plots was given by Richards 

 and Dawson (1927). The changes in division rate may be plotted to 

 advantage as a running average. The three-day running average is readily 

 calculated. If x^, X2, x^, . . . Xa are the daily rates for n days, the value 

 for the first is Xj = {2x^ -\- x.^)/^; the second, x^ — [x-^ -|- ^"2 -j- x^) /y, 



