4i8 



MANUAL OF BACTERIOLOGY. 



hours; the quartan parasite with benign quartan malarial 

 fever, the cycle of development requiring seventy- two hours; 

 and the estiva-autumnal parasite with malignant, estivo- 

 autumnal fever, developing to maturity in a variable period of 

 from twenty-four to forty-eight hours. The parasites are 



FIG. 1 06. 



FIG. 107. 



FIG. 108. 



FIG. 109 



FIGS. 106-109. Malarial parasites in various stages. (X 1000.) 

 Figs. 106, 107 and 108 are tertian parasites. Fig. 108 shows the completion 

 of segmentation. Fig. 109 is the cresccntic form of the estivo-autumnal parasite 



studied to best advantage in a drop of fresh, fluid blood placed 

 between a cover-glass and slide and examined with an oil- 

 immersion objective. For method of making and staining 

 dry preparations see pages 45 and 108. 



Tertian Parasite. This appears in its youngest form as a 



