420 



DISEASES OF THE BLOOD. 



disturbance is due to piroplasmosis is furnished by examination of the 

 blood, in which the parasites may be found in very small numbers in 

 certain blood corpuscles. 



Calves seldom take the disease except in the benign form. 



Fig. 194. — A, red blood corpuscles containing pear-shaped Piroplasma higeminum 

 (the typical form) ; B, red blood corpuscles containing round Piroplasma hige- 

 minum. (After Lignieres.) 



Lesions. At first glance the lesions appear to resemble those of 

 anthrax, but may be differentiated from them in many details. 



The skin is covered with ticks or shows traces of their punctures. 



Fig. 195. 



The myocardium appears as if boiled, the spleen is invariably 

 hypertrophied and two or three times as large as in the normal state. 



The kidneys are violet in colour and congested, and the adipose 

 layer surrounding the kidney is infiltrated with a yellowish serosity. 



