RAYMOND G. HUSSEY 



513 



animals were not x-rayed. One control and one test animal were 

 bled again 24 hours later and the other control and test animals were 

 bled 48 hours after the x-ray exposure. 2 weeks later the test animals 

 were bled again. The observations made on the plasma obtained at 

 these times are given in Table I. 



TABLE I. 



This experiment was repeated with results similar in magnitude to those given. 



2, Two rabbits were bled then x-rayed as stated. Blood was 

 obtained from one of them an hour after the x-ray exposure, and from 

 the other 3 hours after. The results of the observations on the plasma 

 obtained are given in Table II. 



TABLE II. 



In other experiments observations have been made on the plasma 

 at various intervals following exposure to the x-rays and the above 

 results corroborated. 



Blood counts have been made on rabbits which were bled as well 

 as x-rayed, and on others which were x-rayed only the changes do not 

 differ signilicantly. When counts are made at 15 minute intervals the 

 first decrease we have noted on the mononuclear elements occurs 



