14h 



GUIDE TO THE CORAL GALLERY. 



victim. The life history of one of these parasites has been fully 

 worked out by Schaudinn in the case of the Trypanosome (^Trypano- 

 niorpha nodufe) of the Stone Owl, the other host being the Gnat 

 (Ciilex pipiens). The Stone Owl is tolerant of the parasite's existence, 

 and suffers no harm from its presence. The G-nat 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 paJpaUs) infected with Trypanosoma 

 yambiense, the fly itself having become infected by suckiug 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. IOg. 



Fig. IOh. 



Stomach of mosquito with cysts of 

 malarial parasite, X 40. Ocs., ceso- 

 phagus; si., stomach ; c?/., cysts; 7nt., 

 malpighian tubules ; int., iutestine. 

 After Ross. (From Minchin's 



Sporozoa, Lankester's Treatise on 

 Zoology.) 



B. 



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. IOh) 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 hrucei, which is inoculated by the stab 

 of the Tsetse fly {Olossina 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. 



