336 SENSITIZATION TO HEAT 



longer withstand normal room temperatures. We might, perhaps, 

 with equal propriety say that the death of Paramecia following 

 fiuorite radiation is in reahty a destruction by heat. The organism, 

 as a result of the exposure, has been sensitized to heat so that it is 

 no longer able to withstand its normal optimum temperatures. 



This statement is made in order to emphasize the importance of 

 heat sensitization rather than to suggest an explanation of the 

 nature of the action of rays. Nevertheless, no theory of the action 

 of rays can be complete which does not take the results of such ex- 

 periments into consideration. 



