SPOROZOA 



197 



the power of undergoing an asexual division (see Fig. 64). 

 The minute form swells into a large body and breaks up into 

 small spores. When this mass of young forms has reached a 

 size too great for the red cell the latter bursts, synchronously 

 with which we have the chill. By this bursting young forms 

 are again set free in the blood, each capable of entering other 

 red blood cells. Of course, not all the cells are affected, but 

 in severe cases one of every thirty red blood cells may con- 

 tain the parasites, but as the disease progresses and succes- 



FIG. 68. In Culex the palpae (a) of the female are very short, of the male 

 are longer than the proboscis; in Anopheles the palpse (6) of both sexes are 

 about equal in length with the proboscis. (From Kolle and Hetsch.) 



sive crops of corpuscles are destroyed the sum total of the 

 damage may be great. As a result of this, severe grades of 

 anemia result. The cycle of development from the young 

 form to the bursting requires forty-eight hours for the 

 tertian malaria and seventy-two hours for quartan malaria, 

 while in estivo-autumnal malaria there is a slowly progres- 

 sive attack on successive cells by a curious extracellular and 

 irrtracellular crescent-shaped body. 

 The anatomy of these plasmodia is of great intricacy, and 



