6f) 
particularly all species of Glossina, must be regarded with suspidem. 
While, perhaps, the task of controlling the spread of sleeping sickness 
would become impossible if every biting insect had to be considered, 
it is not so with regard to the tsetse flics, and 1 would hope that oo 
every occasion on which you have the opportunity you wcHiId 
emphasise the importance of not simply regarding 67 . falpalis alow 
as dangerous. The question of the etiology of the disease is in a 
more unsatisfactory condition than the treatment, at all events from 
the prophylactic point of view, and it is most important that some 
definite effort should be made to find exactly what flies, tsetse and 
others, are capable of carrying the virus. 
‘As to enlarged glands, 1 have found that a fairly large perrenugt 
o the tiatives (roughly 30 to 40 per cent.) have palpable glands which 
come chiefly under the “ + - g,oup of Duttons and Todd's 
c assification, though there are also a number of " + — " glands. On 
puncture these were found to be uniformly negative. This occurrence 
o en urged glands rather complicated the diagnosis, for it means that 
until til negro with enlarged glands must be considered, 
be acceptedfm Nort^°ETs’t Rhtd'‘ 
land as well r Rhodesia, and, presumably, for N>-assa. 
person who r 1 ® medical officer is the only 
L elrv I T - -fsfactorily, since puncture is 
”fave spiral mT;'* Company 
looking for cases and cett^ ° to travel through the country 
will be necessirv Lr if Whether i. 
uncertain as yet. ‘aken in Xyassaland is 
disease to the norih rad^'of 
endemic on Tanganyika at Vn. ' !t Trypanosomiasis is 
above the Congo-Rhodesia border^an^b T' 
Side of this there is unrestricted * the people on cither 
found right round the southern enTTr'’""' " 
extremely probable that cases of ff a so that it is 
of the country. Whether the dis ^ are present in that part 
Africa in this neighbourhood tt: ’k 
the disease. If „„„ IZt l ’, 
gets over where these fl.es oecur an ■ 
