CULTURES 



47 



kept at a constant temperature. Organisms which natur- 

 ally grow at body temperature (37 C.) as Bacillus coli, 



I 



a 

 I 



1 



Streptococcus pyogenes, etc., may, w#Ji rffte exception of 

 gelatin cultures, be kept in the 37 C. incubator. 



Always place cultures in tumblers with cotton in the 

 bottom or in small wire baskets; never place them in a 



