i86 



ESSENTIALS OF BACTERIOLOGY 



Certain of the parasites do not, however, go on to segmenta- 

 tion, but, after reaching maturity, remain quiescent and form 

 the so-called gametes or sexual types. In the tertian and 



/ i V3 TH EMDOCiCMCrUS OR 

 (/\ ft0 ASEXUAL, CYCLE. 



11 



THE 



MOSQUITO PHASE: 

 EXOGENOUS 



^SEXUAL CVCLE-. 



Fig. 115. Schema showing the human and mosquito cycles of the malarial 

 parasite: A, Normal red cell; B, C, D, E, red cells containing amebulas or 

 myxopods; F, G, H, sporocytes; J', K', L', M', microgametocytes or male 

 gametes; J", K", L", M", O, macrogametocytes, or female gametes; N', N', 

 microgametes; P, traveling vermicule; Q, young zygote; R, S, zygotomeres; 

 T, blastophore; U, mature zygote (modified from Blanchard's diagram illus- 

 trating life-cycle of Coccidium schubergi) (Rees, in "Practitioner," March, 

 1901). 



quartan varieties these are not very different from the mature 

 organisms, but the estivo-autumnal gametes are crescentic in 

 shape and very characteristic. 



