The Practical Study of Malaria 



Chapter I 

 TO PREPARE BLOOD FILMS 



FOR ordinary work we have no hesitation in 

 saying that it is better to use almost entirely 

 dry films. The advantages of using these 

 are many : — 



1. They are much less trouble to make, 

 especially under the adverse conditions one has 

 to contend with in the tropics. 



2. They need not be looked at at once, but 

 can be put aside until one has the leisure to 

 examine them. 



3. Large numbers, fifty or one hundred, may 

 be taken at once, as will be found constantly 

 necessary, and examined weeks or months later, 

 a thing quite impossible with ' wet ' films. 



4. They give information as to the leucocytes 

 if this is needed, and may be examined over and 

 over again when some new point of view demands 

 a re-examination. 



5. By the use of exceedingly simple methods 

 the routine of blood examinations may be reduced 

 to the greatest simplicity. 



For studying movement, delicacies of struc- 

 ture, for watching the process of exflagellation, 



B 



