650 Immunity and Resistance 



lytic antisera had been added, da Fonseca (75) was able to distinguish 

 Leishmania brasiliensis from L. tropica. Growth of L. brasiliensis was 

 inhibited by anti-brasiliejisis lysin but not by Rnti-tropica lysin. The re- 

 sults were the reverse with cultures of L. tropica. Neither antiserum pre- 

 vented growth of L. donovani in cultures. There are also indications that 

 species of Trypanosoma may be differentiated by lysis in vitro (105), al- 

 though there may be difficulties with group reactions. 



LITERATURE CITED i 



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^ For detailed reviews of the earlier literature, see: (a) Taliaferro, W. H. 1929. The 

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 Immunity against animal parasites (New York, Columbia Univ. Press). 



