398 TRYPANOSOMA 



as urticaria, or in extreme cases a distinct localized ulceration 

 may occur. The scrotum and penis in the male and the vulva 

 in the female are often swollen, and ulcerations of the penis or 

 vulva are frequent symptoms especially in dourine.'' 



The geographical distribution of the trypanosomiases is 

 shown in Fig. io6. 



The following table of trypanosoma compiled bj^ Smedley 

 gives the distribution, means of dissemination and the patho- 

 genesis of the various species. 



REFEREXCES. 



1. Button axd Todd. First report of the Trypanosomiasis Ex- 

 pedition to Senegambia (1902). Thomson Yates, aud Johnson Labora- 

 tories Report, \o\. V. 



2. Laveran and Mesxil. Recherches morphologiques et ex- 

 perimentales sur le Trypanosomi des rats [Tr. Lewisi, Kent). A7in. 

 de r Inst. Pasteur Vol. XV 1 1901), p. 673. 



3. Laveran et Mesnil. Trypanosonies et Trypanosomiases. 

 Paris. 1904. 



4. Now, McNeal and Hase. The Cultivation of Tr. Brucei. 

 The Jour, of Infectious Diseases, Vol. i (1904), p. i. 



5. Petrie. Observations relating to the structure and geographi- 

 cal distribution of certain trypanosomes. Jour, of Hygiene, Vol. V 

 (1905), p. 191. 



6. RoDET ET VALtET. Contribution a I'etude des Trypanoso- 

 miases. Arch, de Med. Exper., Vol. XVIII (1906), p. 450. 



7. Smedley. The Cultivation of Trypanosomata. The Jour, of 

 Hygiene, Vol. V (1905), p. 24. 



8. Thiroux. Recherches morphologiques et experimentales sur 

 Trypanosoma Paddae. Ann. de I' Inst. Pasteur, Vol. XIX (1905), p. 65, 



