Morphology of a Trypanosome of Sleeping Sickness, etc. 29 
to prospecting for minerals. The party consisted of two Europeans and ten 
natives. On the journey northwards he passed through Fort Jameson, 
Landazi, and Chinsali to Kasama, where he arrived about the beginning of 
June, 1909. During this northward journey, W. A. passed through an area 
infested by Glossina morsitans. He stayed two months at Kasama, a place 
from which we have no records of any species of Glossina.* On the return 
journey he passed through Mpika (where Glossina morsitans occurs), Serenje 
(no records of Glossina), and Mzaza (where there is Glossina morsitans). 
He left Mzaza on September 10, and travelling along the Luangwa River 
he reached Feira on September 28. During this part of the journey he 
would pass through an area infested by Glossina fusca, between Mzaza and 
Hargreaves. 
He first fell ill on September 20, but after a rest of two days continued his 
journey. A short stay was made at Feira and then the return journey was 
continued through the Hartley district to Salisbury, where it was found that 
he and one native were suffering from trypanosomiasis—parasites being found 
in his blood in Africa on November 17, 1909. 
The patient stated that he had never been near either Lake Tanganyika, 
Lake Mweru or the Luapula River, which are known to be infested by 
Glossina palpalis. He thought, himself, that he contracted trypanosomiasis 
while travelling along the Luangwa River, between Mzaza and Feira. The 
Luangwa Valley is heavily infested with Glossina morsitans, but Glossina 
palpalis has not yet been found along the course of this river. 
Dr. Bagshawe’s article, already noted, on “The Transmission in Nature of 
Trypanosoma gambiense,” should be consulted as to cases of as Sickness 
contracted in areas infested by Glossina morsitans. 
We may note that the case of W. A. has been studied by R. Ross and 
D. Thomson, who have found a regular periodical increase in the numbers of 
the trypanosomes in the peripheral blood of the patient from day to day. 
It is also of interest to record that the Rhodesian strain of trypanosome 
from W. A. is somewhat more virulent to rats and guinea-pigs than the old 
laboratory strain of 7. gambiense, a fact already confirmed by other workers 
in the laboratory. Further, this Rhodesian trypanosome is resistant to 
atoxyl. 
Morphological Features. 
It may be stated at once that the peculiarity of this Rhodesian trypanosome 
is that among the stout or stumpy forms some have the nucleus at the 
postertor (non-flagellar) end. 
* Bagshawe, 8.S. Bulletin, No. 18, June, 1910, p. 197. 
tT ‘Roy. Soc. Proc.,’ B, 1910, vol. 82, pp. 411-415. 
