6 PROTOZOAN PARASITES. 



In several cases both Rivolta and Pfeiffer have 

 observed flagellata in these growths. The form 

 observed by Rivolta in pullets and young Pigeons 

 has one flagellum as long as the cell at the obtuse 

 end of the body, the other or acute end of the body 

 being provided with three flagella united at the base ; 

 these round or discoidal bodies, pale in colour, 

 he named Monocercomonas gallium. The affection 

 caused by the millions of these minute organisms is, 

 he says, distinguished from diphtheria by the exudate 

 being only slightly attached to the mucous membrane. 

 I found these loose growths contained spores of 

 Coccidia and only flagellulaa in the uppermost layers 

 occasionally. Many of the flagellulae apparently had 

 only one flagellum, and I believe were nothing more 

 than a flagellate form of Coccidia. There were also 

 numbers of Tricomas in two instances in the slime 

 on the top of the exudations. 



Pfeiffer states that these Tricomas lose their 

 mobility in the tissues, and assume an amoeboid 

 condition, the encysted form and even that of round 



cells. 



The above authority looks upon the presence of 

 bacilli in this form of diphtheria as secondary, and 

 that they only appear when these parasites have 

 broken up the epithelium ; and this my observations 

 entirely endorse. 



Cornet and Babes found that the flagellata die 

 after being multiplied in culture-broth for a few days, 

 and they believe* that these flagellata only play a 



