357 



remaining in the blood, but they may again, by parthenogenesis, 

 produce all the other forms and so a relapse of the disease (Cf., 

 relapses in malaria by parthenogenesis of the makrogamete). 



1,1.6 - l^ettinj Shjes [^aUenJiii) 

 // S.J =■ /rjiaTttjbme Stirpes, 



Fig. 79A. Upper figure: shewing the three kinds of ookinet and 



the three trypanosomes developed from them in the mosquito's 



stomach. Lower figure : shewing the development of the indifferent 



trypanosomes into ' halteridia ' in the blood [after Schaudinn). 



A: Development of the male trypanosome from the ookinet. 



The male ookinet is hyaline without reserve stuffs, coarsely 

 vacuolar and refractile. It is smaller than the two other 

 ookinets, but has a relatively larger nucleus rich in chromatin. 

 By similar nuclear changes trypanosomes are developed. 



