126 
posts twenty-nine inoculations were made from cattle whose blood 
showed trypanosomes of this type. One rat showed organisms twice, 
after the original and after a rc-inoculation, but for one day only in 
each case ; a second rat only became infected after several months' 
incubation. Dutton, Todd and Kinghom * consider this Congo 
trypanosome as 7 . dimorphon on the grounds that the morphological 
characteristics of this species are peculiar in the genus Tryfamsma, 
and identical with those of the form they describe; and that the 
variation in virulence is not sufficient proc*f that more than one species 
of trypanosomes was present. 1 he trypanosome which wc describe 
shows animal reactions approaching those of the Gambian strain; all 
our dogs, rats and guinea-pigs have succumbed to an acute infection 
within two months, and, as in Gambia, the rabbit has a more chronic 
disease and the cattle an acute lorm. With similar morphologtf 
appearances and similar animal reactions, we consider the Rhodei 
form to be T. dimorphon, Dutton and Todd, 1904. 
We have much more hesitation in ascribing the second of the 
Rhodesian cattle trypanosomes to a specific class. The morphological 
characteristics seen in animals which were susceptible are not 
su dent to consider it dimorphic ; ‘ tadpole ’ forms, or any approach 
to these, were not encountered ; the variations seen were not greatei 
lave been found in monoinorphic trypanosomes, and to this 
group It IS assigned. We distinguish it from T. dimorphon which 
"b" of -- 
e morphological appearances; the fairly constant size 
and the extreme rapidity. 
2. The clinical type of disease induced ; the great daUy vani- 
ion o temperature as opposed to the ' curve ' in cattk 
stri^'^^f kT and the absence of the 
striking febrile reactions seen in sheep and goats. 
dLs"r"‘ gumea-pigs and three 
there^w mfected, and in those which did 
^i7Z"t:T:T 
j inoculated with this trypanosome, 
-d were not show.ng paras, te., a re-.noenZ, wlh 
