36 



AMERICAN MUSEUM (HIDE LEAFLETS 



the malarial amoebule divides, till six to sixteen daughter nuclei may he 

 seen (Fig. 27, E l. By the time this nuclear division is complete, almost 

 the entire original contents of the red corpuscle have disappeared, little 

 remaining of it hut the thin cell-membrane, rilled with the enlarged 



Asexual parasitic mass. At last the wall of the corpuscle hursts, 



Multiplication and the parasite is liberated (Fig. 27, Hi. Its proto- 



of the Parasites i i i ,i • / ■ - • i i • . 



plasm has by this tune divided into as many parts as 



there are nuclei, and each resulting part forms a new spore, which in 



its turn, enters a red blood corpuscle (Fig. 27, A). The same process 



of growth at the expense of the blood cells is then repeated, and new 



spores are formed by division, accompanied by the destruction of an 



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FIG 27 THE MALARIAL PARASITE. (TERTIAN, i ASEXUAL CYCLE IN THE 

 HUMAN BLOOD. 



A. Malarial --pore entering a blood corpuscle (schematic), B.C. .Malarial 

 parasite in the blood corpuscle. I). Enlarged, amoeboid parasite. E. Growth 

 and division of the parasite. H. The malarial blood-spores liberated by the 

 bursting of the blood corpuscle. Magnification 1600 diameters. Alter Huge. 



ever increasing number of red blood cells. This process of multiplica- 

 tion, which constitutes the asexual cycle in the life of the malarial para- 

 site, may go on for a considerable period, till the blood is filled with 

 billions of minute organisms. In time, however, certain of the spores, 

 after entering fresh corpuscles, do not divide, hut they develop into 

 forms of the parasite which, if taken up by a Malaria Mosquito, will con- 

 jugate and reproduce sexually (Fig. 28). 



These new forms, which are approximately spherical in shape, are 

 of two kinds (Fig. 20, A): larger (A) female (egg) cells, and somewhat 

 smaller (A 2), male cells. The latter give rise to long filamentous sperms 



