232 



PROTOZOAN PARASITISM 



two, four or more, may be seen in the feces, and oc- 

 casionally the peripheral budding. 



In the stools of diarrhoea or dysentery, particularly 

 in liquid stools with inflammatory exudate, and not 

 uncommonly in the purged stool, the organism may 



Fig. 37. — Blastocystis hominis. 



Drawings of specimens from culture exhibiting the single cell 

 and multiplication to produce two and four. Stained by iron- 

 haematoxylon. x 900. 



occur in enormous numbers and grow to large size, 

 a diameter of 25 to 40 microns being not uncommon. 

 In such specimens evidence of division is more com- 

 mon. In culture it grows profusely in several me- 

 diums, the serum saline medium being the simplest, 

 attains large sizes and shows numerous dividing 



