263 
IV. A monkey ( Cercopiihecus ) was inoculated May 17, 1904, with blood from 
i ^eping sickness case. She showed trypanosomes in her blood June 13; they 
were seen at intervals up to June 13, 1905, and not again. The animal died 
August 5, 1905, from miliary tuberculosis ; no trypanosomes were seen at the 
autopsy. (This experiment is reported merely for its interest, as showing a chrome 
infection by T. gambiense in a monkey.) 
X. CONCLUSIONS DISCUSSED 
A. Cattle trypanosomiasis probably exists everywhere in the 
Congo Free State. Broden 3 is also of this opinion. Since large 
game and Glossina are practically omnipresent 1 (perhaps with the 
exception of high land about Lake Kivu) it seems possible that it 
should be so; at all events, trypanosomes were found in every herd 
examined save those at Nyangwe, Cabinda and Lusombo. That the 
cursor)' examinations made at these places might easily have failed to 
detect infected animals is certain (see charts). 
B. The causative trypanosome is probably identical with 
Trypanosoma dimorphon. Three ways of identifying trypanosomes 
are at present recognised; all of them are liable to error. They are 
(1) The morphology of the parasite in infected animals and in 
cultures* Cultures have been made of very few of the African 
trypanosomes, and were not used in the present instance. (2) Animal 
reactions. (3) Cross inoculations. 
(1) Morphology. It is well known that the form and dimensions 
of all trypanosomes may vary more or less, but when an unknown 
trypanosome varies in exactly the same way as does a known 
trypanosome (compare the Congo parasites we describe and 
trypanosoma dimorphon ) their variations become a strong proof of 
identity. And this especially in the present case, since no trypanosome 
of domestic animals shows such wide divergencies in form as does 
^ dimorphon. 
•Ml the forms seen may be approximated to the three types of 
ir ypanosoma dimorphon as described by Dutton and Todd. 6 At 
^ ala ’ "’here the cow was suffering from an acute exacerbation of the 
d, sease, the - long" type were almost entirely seen, but one “ tadpole 
fomnv as observed. A t Romee, where the disease was chionic, on y 
tar y fanM S f^ 3enat ' ons on Trypanosoma brucei and1 that an 
State su §8 est a realization of S< * a ^* oa P wo uld come with 
a fuller 1. asSl 1 ficatlor ‘ and differentiation of various haematoz 3 h sts (Koch. 
|! Slie kn C edg , e °i the,r ,ife c y cles in either or ‘ 1 e^Me der KonigHch 
preussivt, ltersc heidung der Trvpanosomenarten. Sitzung iqov) 
S,Schen Akedemie der Wissenschaften, XLVI Sitzung vom Non. 23, *9 5 
