PIROPLASMID.E 173 



haemoglobin, which is excreted by the kidneys of the cow, sheep, 

 horse, dog, etc., acting as host. The disease produced, variously called 

 piroplasmosis or babesiasis, is consequently characterized by a red 

 coloration of the urine known as haemoglobinuria, or popularly as 

 " red-water." One of the best known piroplasms is Piroplasma 

 bigeminnm or Babesia bovis (probably the latter name is correct), 

 which is the causal agent of " Texas fever " or " red-water " in cattle 

 and is spread by ticks. 



Cycle 



showing the usual mode 



of multiplication 



of 



Nuttallia equi 



in the circulating blood 



FIG. 90. Nuttallia equi, life-cycle as seen in red blood corpuscles in stained preparations 

 of peripheral blood. (After Nuttall and Strickland.) 



Of recent years, researches on the morphology of these blood 

 parasites has led to their separation into various genera and species. 

 However, our knowledge is still very far from complete. The various 



