2 54 
forms with free flagellum were in the majority. In both types the 
cytoplasm often contained small reddish granules, which were most 
frequently observed in the posterior half of the body. In some thirty 
sub-inoculations with this strain the trypanosomes of both types have 
been constantly present. At the inception of the disease the “stumpy 
forms are much more abundant, but as the affection proceeds the 
“long" type assumes the preponderance. In the monkey sub-inocidaUi 
a few of the “ tadpole” forms were observed. 
In fresh preparations the two types can be very easily distinguished. 
The long, slender form has a long flagellum and moves very rapidly, 
lashing in and out among the corpuscles. It progresses for a short 
distance, then stops, and in a few moments moves on again. It 
often moves fairly rapidly' across the whole field. Occasionally it 
adheres to a corpuscle, and after twisting and lashing about for a short 
time breaks free and moves off. While the parasite progresses with 
the flagellar end in front as a general rule, it occasionally moves 
backwards for a short distance. The second form is broader and 
shorter than the first, and is much more sluggish in its movements. 
I hese consist chiefly of doubling and twisting of the trypanosome 
on itself. 11 does not progress far, but remains pretty constantly in 
the one spot. The undulating membrane and flagellum are very 
poorly developed in this variety. In contradistinction to Dutton and 
rodd, b dividing forms, of the usual longitudinal type, were seen in 
this “ stumpy ” type. 
(c) Antelope trypanosomes 
In the antelope (Tragelaphus scriptus) killed at Mswata 
trypanosomes corresponding to the “tadpole” type were seen, but 
were very scanty. In the one sub-inoculation the parasites retained 
this type. Dividing forms of the usual longitudinal type were 
observed. 
In the antelope at Kasongo the trypanosomes were of the second 
( stumpy ) and third (“ long ’) varieties as found in the cattle. In 
the sub-inoculated animals these two types persisted; the stumpy 
orms being in the majority in the preparations examined. It was 
impossible to study this parasite fully, since the animal in which it was 
rought to England was accidentally killed and the strain was lost. 
