■8o DISEASES DUE TO PROTOZOA 



A-ertebrates other than man, or probably the mosquito may infect its 

 own eggs, and thus hand down the infection without tlie human 

 element being present. This has not been demonstrated. 



CHARACTERISTICS OF THE MALARIAL PARASITES. 



(Alodihed after Manson and Mannaberg.) 



For brevity in this statement " O " will mean Quartan, " T " 

 Tertian, and " S-T " Subtertian. 



DURATION OF DEVELOPMENT. 



O. 72 hours. 

 T. 48 hours. 

 S-T. 36 to 48 hours. 



MOVEMENT. 



Q. Slight movement in the immature forms. 

 T. Active amoeboid movement in the immature forms and also 

 in the middle-aged forms. 

 S-T, Active movement; remains present in the pigmented stage. 



H^EMOZOIN. 



O. Coarse grains; little or no movement. 



T. F"iner grains in immature forms; often in the larger actively 

 swarming. 



MAXIMUM SIZE. 



Q. The size of a red blood corpuscle. 

 T. Ditto, sometimes a little larger. 

 S-T. Half to two-thirds the size of a red cell, 



FORM OF SEGMENTATION. 



O. Daisy form; the single spores roughish, \\\\.\\ distinct 



nucleolus, 

 T, Sunflower or grape-like spores, single, round, small, 



nucleolus rarely seen. 

 S-T. Irregular heaps. 



NUMBER OF MEROZOITES. 



Q, 6-12. 



T. 15-20, often less. 

 S-T. 10-12, rarely 15-16, 



FORM OF GAMETOCYTE. 



O. A sphere. 



T. A sphere. 



S-T. A crescent. 



