28 



it is seen to alter its shape. The diagnosis of a 

 ring from a vacuole is not difficult if the latter is 

 carefully focussed,when it will be found impossible 

 to get a sharp outline as in the parasite, the outhne 

 on the contrary ' opens out.' Crenated corpuscles 

 are very frequently taken to be parasites. The 

 crenations focus alternately as dark and bright 

 points, and they have no clear ring outline. 



Fig. 3B. I. Thin portion of film. 2. Thicker portion: 

 (a) a distorted corpuscle with no pigment; (6) a crescent with 

 pigment. 3. Crenated corpuscles. 4. Commencing crenation. 

 5. (c) Red cells with processes; (d) a male gamete with flagella 

 and pigment. 6. (e) vacuoles ; (/) a crack ; (g) a young parasite 

 with very fine pigment ; (h) a segmenting parasite with central 

 pigment mass. 



Isolated platelets in the plasma or lying on a 

 corpuscle appear as little granular masses, but 

 again they have not the opaque white look of 

 parasites nor the definite ring form, nor are they 

 amoeboid. Here, as in the stained specimen, the 

 definiteness of the body should prevent mistakes 

 being made. 



