17(i 



This corresponds very well willi the I'esiills obtained 

 by counting the mitotic figures in the total line ol' periphery 

 in the stained cultures by the first method. 



If T is the average time between two succeeding divi- 

 sions of the same cell; and N is the total number of cells 

 observed, we get the following ex]3ression for the number 



(IX 

 of cells -jr which are dividing in a unit of time: 



^ = In 



dt T 



If the time-unit, for the sake of simj)licity. is set equal 

 to 12 minutes, i. e. equal to the time the process of mitotic 

 division on an average lakes, the expression can be 

 changed to: 



n _ 1 

 N " T 



where n is the number of mitosis in a given moment. ,As 



n 

 mentioned befoi'e ^ ''^ equal to 2 o/o ; the ecpialion will 



then be: 



T = — J-— X 12 minutes —-- 10 hours. 



