98 



MANUAL OF HUMAN PROTOZOA 



With a little practice, a satisfactory thick smear without 

 crackling or peeling of the blood film can be made. It will 

 take two hours or more to dry. Do not dry by heat, but 



Fig. 26. Diagrams showing how a thin blood film is made. 



placing it in an incubator at 37°C. will hasten the drying. 

 When it is thoroughly dry, immerse it in water and de- 

 haemoglobinize it. Air dry again. 



Thin and thick film. Sometimes it is time-saving if thin 

 and thick films are made on a single slide. Place a single drop 



