i8 



TROPICAL MEDICINE AND HYGIENE 



one containing the subtertian parasite. In a subtertian 

 infection the red corpuscles containing the parasites may 

 be altered in colour, appearing more yellow, the so-called 

 " brassy bodies." 



There is a difference in the size of the youngest 

 parasite of benign tertian and quartan, as the quartan 

 " spores " are the larger, but both are considerably larger 

 than the youngest forms of the subtertian parasites. 



FIG. 6. a to f t Phases in the asexual development of the quartan parasite ; 

 x to s, phases in the sexual development. 



In the blood examined a few- hours later in either 

 tertian or quartan malaria the parasite will be larger and 

 the amoeboid movements greater in extent, so that the 

 parasites are much more irregular in shape. As a rule 

 the amoeboid activity is greater in tertian and the pseudo- 

 podia are often finer and much more irregular in shape. 

 Pigment will be present in both ; that in tertian varies 

 in colour from light brown, almost yellow, to dark 

 brown, nearly black, in rare instances. In quartan the 



