THE PREPARATION OF CERTAIN SPECIAL MEDIA 45 
Group E. Media either necessary for or especially desir- 
able for the cultivation or differentiation of certain pathogenic 
bacteria. 
Acid agar (in small tubes). 
Acid glycerin agar (in small tubes): 
Acid glycerin bouillon (in small tubes). 
Blood serum (dog) solidified at 70° to 75° C. (ground-glass- 
‘capped tubes). 
Loeffler’s blood serum (usually small tubes). 
Egg medium (Dorset). 
