MALARIAL PARASITES 



215 



(Fig. 69, 1-7). It takes about forty-eight hours for them 

 to complete their history, and hence the chills, in the 

 common form of malaria, occur every other day. One 



Fig. 69. Malarial organism. 



2-7 show the stages that occur in ordinary blood, 7 representing the spores which appear 

 after the blood corpuscle breaks to pieces. These spores are like 2 and immediately 

 enter into fresh corpuscles, as at 3. 8 shows a so-called crescent body in the corpuscle. 

 The crescent bodies become the sexual bodies, 9 and 9a, which develop in the mosquito. 

 10 shows the union of the female sex body, 9, with one of the flagella of ga. 11-15 

 show the development of the united mass, 10, in the body of the mosquito, finally 

 producing spores such as shown at i. 16, the intestine of the mosquito, showing the 

 malarial organism attached. 



form of the parasites, however, requires three days to com- 

 plete the cycle. The malarial parasites remain in the blood 

 and never pass out of the body by any of the ordinary 

 excretions. There is therefore no direct means by which 



