6o 
is to continue experimental work on treatment, which shows with 
this combination of atoxyl and mercury indications of success which 
have never been obtained by any previous method of treatment. 
‘ It must be understood that these notes arc merely for guidance, 
as it is impossible to make more dogmatic statements after so short 
a period of research, and that any deductions drawn therefrom arc 
susceptible of modification.' 
It will be gathered from the preceding statement that the loss 
from disease is increasing—that they had verified its existence in 
36 cases ; that they had isolated two distinct species of tr)'panosomes 
—one closely allied to T. dimorphon, the other possibly identical 
With T. vivax ; that large doses of atoxyl were beneficial; that with 
regard to the question of transmission, they walked healthy cattle 
through a narrow fly belt, and that three tsetse ( 67 . morsitans) were 
o served to bite. Fifteen days later T. vivax was found in their 
blood, and on the eighteenth day T. dimorphon ; further, after 
investigating an outbreak, they concluded that there was strong 
suspicion that two genera of biting flics acted as transmitters-one 
17 X'' Lyperosia. They also conclude tha. TaW 
may take a part m transmission, as it does in Algeria and India. 
DecembeT™'^ 
Gl. pal Palis and r/ 
deeping sickness, and To“”er“m"n ' oTt‘'" f 
the spread of sleeping sickness. for preventing 
■ I leff M A ' December 18. 190;. 
i left Madona on the 20th rhf m , 
Luapula as far as KazembiV 1 November and went down the 
From there I went East f’ south of Lake Mweru, 
place along the Luengo river^^ s^ota s and then retunied to this 
‘I did not look for Gl -tnl^ r 
as that had already been don ^ ^ Luapula particularly, 
that this fly exists along a 1 ^' ^ ^^derstand from Dr. Spillanc 
caught specimens of Gl. course. However, I 
and again opposite the Tohnet ^^ridge over the Luongo 
™ad from Madona to KaM ^ ‘he Z 
^^“gwisi. , 
specimens of 
Jtist at the commencement of the Falk 
