120 
KEPORT OF TRAVELLING PATHOLOGIST AND PROTOZOOLOGIST 
Work at Wau, 
on the Jur 
River 
Experiments 
on guinea 
worm infection 
Work at 
Barboi, 
White Nile 
At Nasser several ol 1113 ’ men contracted malaria of the malignant type, and the 
inconvenience of this, together with the inclemencj' of the weather, did not improve one’s 
outlook on this benighted spot. I was not sorr^^ to leave for Wau, in the Bahr-El-Ghazal 
Province, on -lulj' 12!). Wau was reached on August 1(5. On September 4 a short trip of a 
week’s duration was made to a point about ten miles up the Sueh iiiver in the hope that 
Glossina morsitans would there l)e found. There were no Glossina morsitans, however, but each 
dav two or three specimens of Glossina palpalis were taken in the floating laboratory. This is 
the first time that Glossina palpalis has been noted from this river. After my return to Wau 
occasional specimens of tbis flj" were taken there. Two or three years ago Captain Ensor 
reported having taken a single example of G. palpalis in Wau, Irut as he had just returned 
from a fly district there was the possibility that the fly had been imported in his baggage. 
Evidently Glossina palpalis occurs in and around Wau and along tbe Sueb River. In Wau 
itself 1 did not meet with Glossina morsitans. Here trypanosomes occurred in numbers 
of cattle and transport animals, but according to tbe distribution of Glossina morsitans animals 
remaining in Wau apjiarently did not become infected with Trypanosmna pecaudi, and only 
contracted this form of tr\panosomiasis if they were taken out of Wau to a district infected 
with Glossina morsitans. Glossina p)alpalis occurring in Wau were either there in insufficient 
nundters or were incapable of transmitting the malady. 
At the hospital at Wbiu numbers of cases of guinea worm were admitted for treatment. 
Advantage was taken of this to conduct some experiments. Cyclops could be obtained in good 
numbers in the pools in and around Wau, and these I infected with the guinea worm 
embiyos. The embryos seem to enter the cyclops “ tail first ” by first penetrating the cuticle 
of the cyclops with their sharp extremities. I was able to confirm the observations of Leiper 
that after the embryo had completed its metamorphosis and become quiescent within the body 
of the cyclops, addition of 0 2 per cent, solution of hydrochloric acid killed the cj’clops but had 
the opposite effect on the metamoiqjhosed embryo, which began to wriggle about and finally 
escaped from the dead Ijody of its host, thus bearing out the conjecture that man becomes 
infected by taking in cj^clops in drinking water, the experiment with the acid being repeated in 
tbe stomach. I was unfortunately unable to feed monkeys on infected cj'clops owing to tbe 
untimely death of all my material. 
Trypanosomes were found in two species of lizard in Wau, and two interesting pigmented 
intra-corpuscular blood parasites also in lizards. W^hile in Wau all my men had malaria at 
one time and another in spite of the administration of quinine eveiy tenth and eleventh day. 
I myself likewise became infected at this place. 
Owing to an unprecedented fall in the Jur River I was compelled to leave Wau earlier 
than I intended, and thus much of the work 1 had in hand there was suddenlv' cut short. 
Tile floating laboratory accordingly commenced to drift down the Jur River on October 10. 
x\fter much difficulty, caused by the presence of the sudd in the Babr-El-Ghazal, the main 
Nile was reached on November 3, and Barboi Wood Station on the evening of the same day. 
A sta\' of about one month was made at the Wood Station, and then a short trip of a few 
days was taken to the American Mission Station at Doleib Hill on the Sobat, where the Shilluk 
cattle were dying off rapidly. The cattle I found to be suffering from Trujianosonia nanuni 
infection, and also two kinds of Piroplasma, viz.: Piroplasma mutans and Piroplasma 
higeminum. On December 5 the Sobat was left for Bor on the Jebel River, which was 
reached on December 10. 
During my stay here I examined large numbers of cattle, but found parasites onlj* 
in one, viz. a cow, which was passing through Bor on its wav' from Uganda, which it had left 
two days before. It was suffering from Trypanosoma nanum and also Piroplasma mutans 
Trypanosoma nanum infection would thus appear to be of extensive distribution, Ijeing found 
