SLEEPING SICKNESS. 35
"8. Certain species of buck, viz., waterbuck, hartebeest,
mpala, and warthog, have been found to be infected with the
human trypanosome.
"9. A native dog has been found to be infected with the
human trypanosome."
It is interesting to note how closely the results obtained
by these observers with the Rhodesian trypanosome tally
with ours and the Uganda strain for, substituting Glossina
Morsitans for Glossina Palpalis, the other facts are almost iden-
tical with those which we elicited.
To summarise the whole position in a few words.
There are two distinct human trypanosome diseases found
in adjacent parts of Central Africa; one the Uganda form
carried by Glossina Palpalis, the other the Rhodesian form
carried by Glossina Morsitans.
Both diseases are spreading outside their original epidemic
area and they may continue to spread in those countries
wherever the appropriate fly exists.
In both cases a reservoir of infection exists in the wild
game, and the tsetse fly carries the disease from game to
man, and from man to game (possibly also from man to man)
and in this way keeps up a vicious circle.
If these new facts have any further bearing in India other
than that already discussed, they should urge us to strengthen
rather than to weaken our defences against the possible inroads
of this dreadful disease.
F. P. MACKIE.
SHILLONG,
The 26th June 1912.