I06 LABORATORY BACTERIOLOGY 



with alkaline methylene-blue or with carbol fuchsin. Note the 

 appearance of the cocci both within and outside of the pus 

 cells. 



If from supposed tuberculosis, stain for that organism. 



If from diphtheria, stain for that organism and note the mor- 

 phology of the bacteria. 



If from the pus of an abscess, stain for pyogenic bacteria. 



161. Making Cover-glass Preparations from Pus. — Spread 

 as thin a film of the pus as possible on the cover-glass. This 

 can be readily done by drawing the edge of a square cover- 

 glass over the surface of another cover-glass on which a bit of 

 the pus has been placed. See method for making cover-glass 

 preparations from blood (123). 



