100 Inside the Living Cell 



for cancer cells to originate or that, in young vigorous organisms the 

 cancer cell is unable to estabUsh itself, i.e. the controlling mechanism 

 is strong enough to control it. It is a curious fact that, in some 

 instances, cancers cannot be recognized for a long time after the 

 carcinogenic agent has been introduced. There is a long 'lag' period 

 during which the carcinogenic agent is present, but apparently has 

 no effect. 



