TOXOPLASMA 113 



in mononuclear and polymorphonuclear cells in the blood, spleen, liver, peritoneum 

 etc. (fig. 51). The parasites have been found in the gondi, dog, rabbit, mole, mouse, 

 pigeon and other birds. Although various species names have been given to the 

 parasites in these hosts, it seems probable, from cross infection experiments, that 

 there is but one species with several physiological races. Splendore 1 (1913) has 

 described a flagellate stage. 



Castellani (I9I3-I4) 2 has described similar parasites from a case of 

 splenomegaly, with fever of long standing, in a Sinhalese boy. The 



FIG. 51. Toxoplasma gondii, endocellular or free in the peritoneal exudate of infected 

 mice. i, 2, mononuclear leucocytes containing toxoplasms. 3, polynuclear, containing 

 parasites. 4, 5, 6, endothelial cells containing toxoplasms, agglomerated in 6. 7, agglomera- 

 tion forms. 8-1 1, free forms. 12-13, division stages. X 1,630. (After Laveran and Marullaz.) 



t 



3 % 





' 



FlG. 52. Toxoplasma pyroxenes. I, body found in blood. 2-7, bodies found in spleen, 

 [i is about the size of a red blood corpuscle, as drawn in the figures] . Magnification not 

 stated. (After Castellani.) 



bodies were found in the spleen and more rarely in the blood (fig. 52). 

 Castellani has named them Toxoplasma pyrogenes. Further researches 

 are needed. 



1 Bull. Soc. Path. Exot., vi, p. 318. 

 8 



2 Journ. Trap. Med. and ffyg., xvii, p. 113. 



