PLASMODIUM MALARIA 107 



present recognised are, according to Manson, from 

 whom the following table is borrowed : 



Benign \ Z. . do not form crescents. 



I Tertian > 



( Quotidian, pigmented 

 Malignant | Quotidian, unpigmented 

 Tertian 



form crescents. 



The Quartan parasite has much and relatively 

 coarse-grained pigment. The spores are eight to ten, 

 in number, and arranged in "daisy" fashion, and 

 there is no hypertrophy of the infected red cell. 



The Benign Tertian (Fig. 107) is actively amoeboid, 

 in its early stages, and causes marked hypertrophy 

 and decolourisation of the infected corpuscle. The 

 sporulating body is a somewhat irregular cluster of 

 15-20 spores, arranged round a mass of dark 

 pigment. 



The Malignant parasites are very much smaller 

 than the Benign, and tend to assume a ringed form* 

 Multiple infection of the red cell is common. The 

 parasites are very numerous, but tend to pass out 

 of the peripheral circulation into the capillaries- 

 of the internal organs and bone marrow, and the 

 sporulating stage is rarely present in the peripheral 

 blood. Crescents are characteristic of all the forms. 



The pigmented and non-pigmented forms are 



