376 CANINE MALARIA 



preparations showed that 98.9%" of all infected corpuscles con- 

 tained one to four parasites and the balance more than four 

 parasites. Free parasites were found in the proportion of i to 

 2^ infected corpuscles. The spleen pulp contains in most cases 

 a large quantity of blood and the vesscsl in the trabeculae are 

 dilated and contain numerous leucocytes. The proportion of 

 infected corpuscles in the pulp is small (3 to 12%) but in the 

 small trabecular veins it is high (48%). In the kidney there 

 were no changes that were constantly present except dilatation 

 of the blood vessels. In some cases about 46% of the red 

 corpuscles in the vessels of the glomeruli were infected. 



T//e duration in fatal cases is from 3 to 6 days. 



§ 294. Differential diagnosis. The positive diagnosis 

 is made b}' finding the parasite in the red blood corpuscles. 



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