Chapter XIV: Blood 103 



U 4. Wash in water, preferably in distilled water, until the film has a 

 pinkish tint in its thinner or better-spread portions and the red cor- 

 puscles acquire a yellow or pink color. 



" 5. Dry between filter-paper and mount in balsam. The preparations 

 retain their colors as long as any preparations stained with anilin dyes. 



" Unstained blood films may be kept for some weeks without impair- 

 ment of their staining properties. Films months old will probably not 

 give good results." 



6. For Malarial Parasites Wright's stain (memorandum 5) is excellent. 

 It yields the so-called Romanowsky stain; the color of the chromatin 

 varies from lilac to very dark red, while the body of the parasite stains 

 blue. A full account of the method will be found in Mallory and 

 Wright's Pathological Technique, p. 421. 



