40 



DISEASES DUE TO PROTOZOA 



Amoebic suppuration of the brain. Section of a minute abscess. The cavity contains 

 numerous entamcebse and pus corpuscles. The nuclei of both are deeply stained. (After 

 Legrand and Dopter.) x 300. 



Balantidium coli. 

 a, nucleus; ^.vacuole; 

 c, peristome;^, bolus 

 of food. (After 

 Leuckart.) 



n 



Balantidium coli, free and encysted ; a, anus 

 or cytopyge ; ;/, macronucleus ; b, bolus of food, 

 (After Casagrandi and Barbagallo.) 



Balantidium coli. a. Natural condition ; b, reproduction by binary fission ; c, reproduction by 



sexual conjugation. 



