278 



Report S.A.A. Advancement of Science. 



During these periods " control " animals were kept in the same 

 stables, their stalls frequently changed for those previously filled by 

 animals suffering from fever. Also these control animals were provok- 

 ed from time to time by subcutaneous inoculations of the blood of 

 ^oats dying from Heart-water, and of oxen dying from Veld-sickness. 



In the foregoing series of experimental animals it was almost 

 invariably found that where fever was induced, iniracorpuscular or 

 malarial parasites were found within the red blood corpuscles. 



After the fever passed off, the parasite disappeared, but, where 

 a second inoculation produced fever, parasites again made their ap- 

 pearance. 



