THE TSETSE POISON. 
i# 
yards distant, containod not a singlo specimen. This was 
tho moro remarkable as wo ofton saw natives carrying over 
raw moat to tho opposito bank with many tsetse settled 
upon it. 
Tho poison doos not socm to ho injoctod by a sting, or by 
ova placed beneath tho skin; for, when ono is allowed to 
food freely on tho hand, it is seen to insert tho middle prong 
of throo portions, into which tho proboscis divides, somo- 
what deeply into tho true skin ; it then draws it out a littlo 
way, and it assumes a cn arson color as the mandibles come 
into brisk operation. Tho previously-shrunken belly swolls 
out, and, if left undisturbed, the fly quietly departs when :t 
is full. A slight itching irritation follows, but not moro 
than in tho bito of a mosquito. In the ox tnis same bite 
producos no moro immediate effects than in man. It doos 
not startlo him as tho gad-fly doos; but a few days after- 
ward tho following symptoms supervene : the eye and nose 
begin to run, the coat stares as if the animal were cold, & 
swelling appears under the jaw and sometimes at the navel; 
and, though the animal continues to graze, emaciation com- 
mences, accompanied with a peculiar flaccidity of the mus- 
cles, and this proceeds unchecked until, perhaps months after- 
W’ard, purging comes on, and the animal, no longer able to 
graze, perishes in a state of extreme exhaustion. Those 
which are in good conditiou often perish soon after the bite 
is inflicted, with staggering and blindness, as if the brain 
were affected by it. Sudden changes of temperature, pro- 
duced by falls of rain, seem to hasten the progress of the 
oomplaint; but, in general, the emaciation goes on uninter- 
ruptedly for months, and, do what we will, the poor animals 
perish miserably. 
When opened, the cellular tissue on the surface of the 
body beneath the skin is seen to he injected with air, as if a 
quantity of soap-bubbles were scattered over it, or a dis- 
honest, awkward butcher had been trying to make it look 
fat. The fat is of a green ish-yellow color and of an oily 
consistence. All the muscles are flabby, and the head 
