blood. After waiting about a second, that is 

 until the drop spreads to the extent of about 

 one-third inch between the shde and the needle, 

 the needle is evenly and not too quickly carried 

 to the right and so along the whole length of 

 the slide., The right amount of pressure is very 



Fig. I. Authors' method of making blood films 



quickly learnt, and the making of a useful and 

 good film is far easier in this way than in any 

 other known to us (Fig,i). Immediately the film 

 is made it should be waved to and fro until it is 

 seen to be quite dry. The quicker the. film dries 

 the more perfectly preserved will be the red cells 

 of the blood. 



The Characters of a Good Film 



1. As a film is needed to detect even the 

 most minute forms of the parasite within the red 

 cell, it is necessary that the red cells be well spread 

 out and not distorted or lying over one another. 

 To ensure this the film must be uniform and as 

 thin as possible. 



2. Films should be made so that, if desired, 

 the leucocytes may be differentially counted. A 



