MICHIGAN ACADEMY OF SCIENCE. 



105 



TABLE II. 

 Duration of Infection. 

 Time of inoculation till the death of animals that were infected. 



Rats. 



Guinea pigs. 



Averages are based upon only those dying from infection. 



The ratio in Table I is not found in Table II of the animals dying from 

 the infection, especially among the rats. More of them died below the 

 average than above while the guinea pigs are about equally divided. The 

 rats have an average of 18 days and the guinea pigs an average of 68 days 

 a little over three times that of the rats. 



TABLE III.— RATS. 

 (a) Inoculated with blood from rats. 



