14h 
GUIDE TO THE CORAL GALLERY. 
victim. The life history of one of these parasites has been fully 
worked out by Schaudinn iu the case of the Trypanosome ( Trypano - 
morpha noctuce) of the Stone Owl, the other host being the Gnat 
( Gulex pipiens). The Stone Owl is tolerant of the parasite’s existence, 
and suffers no harm from its presence. The Gnat is a true host, the 
parasite undergoing its sexual development in the intestinal tract 
(see the case and illustrations in the Central Hall). 
The Sleeping Sickness prevalent in Tropical Africa is set up by 
the stab of a Tsetse fly {Glossina palpalis) infected with Trypanosoma 
gambiense , the fly itself having become infected by sucking the blood 
of a human victim of Sleeping Sickness, or possibly that of some 
native tribes who have become tolerant of the existence of the parasite. 
Fig. 10g. 
Stomach of mosquito with cysts of 
malarial parasite, x 40. Oes., oeso- 
phagus ; st., stomach ; cy., cysts ; mt., 
malpighian tubules ; int., intestine. 
After Ross. (From Minchin’s 
Sporozoa, Lankester’s Treatise on 
Zoology.) 
Fig. 10 h. 
Trypanosoma gambiense , very 
highly magnified from human 
blood. ( A , after Bruce and 
Nabarro ; B, after Castellani. 
From H. M. Woodcock, 
Quart. Journ. Mic. Sci.) 
At first the Trypanosome (Fig. 10 h) multiplies in the blood, but, later, 
gets into the cerebro-spinal fluid, where its presence gives rise to the 
peculiar nervous symptoms of drowsiness ending in coma and death. 
The Tsetse disease of domesticated animals is caused by the 
blood parasite Trypanosoma brucei , which is inoculated by the stab 
of the Tsetse fly ( Glossina morsitans, and other species). The 
Tsetse fly itself becomes infected by sucking the blood of wild 
Antelope or Buffalo, which are tolerant of the existence of the 
Trypansome in their blood ; but imported cattle, as in the case of 
human beings immigrant in a new region, are not tolerant, and die 
from the effects of the rapid multiplication of the Trypanosome in 
their blood. The Tsetse disease is prevalent in S.E. and S. Africa. 
