29 



In young tropical or malignant tertian rings 

 pigment is very rarely seen. In larger rings pig- 

 ment may be seen, e.g., in simple tertian rings. 



2. Large Forms. — They may occupy the 

 wholfe of the cell and may shew active amoeboid 

 movement and pigment in active motion may also 

 be seen. The pigment may be reddish-brown, very 

 fine, or rather coarser black pigment. The 

 differentiation of these forms will be considered 

 later. 



3. Crescents and Spherical Bodies (Fig. 3). 

 The former are at once as in the stained 

 specimen characterized by their shape. They are 

 distinct, fat, plump-looking bodies, unmistakable 

 when once seen. They always have, besides, a 

 central clump of distinct pigment. Stretching 

 across between each end of the crescent is seen the 

 curved edge of the red cell. The spherical bodies 

 alsO' possess this definite, easily seen pigment mass. 



In fresh specimens, further, the extremely 

 beautiful and striking process of flagellation can 

 be readily seen, provided a suitable case is used. 



Flagellation 



Select a case of (simple tertian or) malignant 

 tertian infection, in which parasites have been 

 found. On examining the latter about a week later, 

 crescents will be found in the blood.. In about 

 twenty minutes, or in hot weather in England in 

 five minutes or less, many of these will be seen to 

 become spherical and to get free of the corpuscle 

 in which they were situated. Two varieties may 

 be distinguished — the male in which the -pigment 

 is distributed over the whole of the parasite, and 



