200 PARASITOLOGY. 
When these swellings are incised a serum escapes in 
which the protozoa can be found. 
TRYPANOSOMA Brucir (Bruce). 
Distributtion.—Found in Africa. 
Description.—The Trypanosoma Brucii are elon- 
gatedand more pointed at the flagellated end; the body 
is slightly curved; the nucleus is located in the center, 
close to the surface; the centrosome is in the blunt 
end and is clearly separated from the flagellum. The 
flagellum proceeds from this end, follows the entire 
length of the body, and projects a distance out from 
the extremity, forming a hair-like appendage as in the 
preceding species. The protozoon measures about 
twenty-eight microns in length by one-half to two 
microns wide; if a drop of blood be drawn they can 
be found actively moving about in it. 
Lite Cycle.—The protozoon divides by simple cell 
division; the centrosome becomes larger and elong- 
ated, then divides into two; the flagellum becomes 
thickened and divides likewise into two; this is ac- 
companied by a like division of the nucleus. The 
newly formed centrosome, nucleus and flagellum find 
their way to their respective sides; then comes the 
division of the protoplasm lengthwise. The two 
newly formed parasites now develop to full size and 
again divide. 
Intermediate Host.—The Glossina Morsitans or 
tsetse fly is the transmitter of the protozoon. 
Animals Infested.—The horse, ass, mule, ox and 
dog. 
Parts [ntested.—Found free in the blood. 
Disease Produced.—Nagana; tsetse fly disease. 
