4 o 



film has been under examination for some time. The 

 processes occasionally break off and float about. 

 Shorter and more granular processes emitted by the 

 red cell are even commoner (Fig. n). 



DISTINCTION OF SPECIES IN FRESH FILMS 



Malignant Tertian. The young rings are the 

 smallest seen. The red cells in which they occur have 

 sometimes, especially perhaps in severe infections, a 

 slightly crenated appearance and peculiar dark colour 

 (globuli rossi ottonati, old-brass coloured red cells). 

 Pigment is rare. 



Simple Tertian. I. The red cell is enlarged and 

 pale. 2. The young rings are more flimsy (but are 

 often extremely difficult to see), and the medium sizes 

 may shew several pseudopodia. 3. Their motion is 

 greater. 4. The pigment is very fine, reddish brown ; 

 in the larger forms it is more easily recognizable. 



Quartan. i. Red cell unchanged. 2. Motility 

 slight. 3. Pigment compact and dark chocolate. 



FLAGELLATION 



Select a case of malignant tertian* infection in 

 which parasites have been found. On examining the 

 patient about a week later, crescents (gametes) 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 'the female, in which the pigment is 



* Flagellation may of course be studied also in simple tertian and quartan. 



