ARTICLES 613 



Substituting these values in the expressions for X t and A, 

 we obtain — 



X x = 2 x io-^^ +l)^2X io'« 

 Xa = 2 x io _6 (t + 100) ^22 x io* 4 . 



In such a tumour therefore it is deduced that one out of 

 every five thousand cells in the dividing stage is going over 

 to the growing stage per second, and one out of every five 

 hundred thousand cells in the growing stage is going over to 

 the dividing stage per second. 



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