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be recognized by the presence of B. coli, spores of B. enteritidis 

 sporogenes and Streptococcus equinus. 



These types of streptococci and staphylococci are mainly 

 differentiated by their behaviour towards certain sugars and 

 alcohols. In the following tables the -f sign indicates the pro- 

 duction of acid, with or without gas. Andrewes and Horder 1 

 have summarized the main types as follows : 



Andrewes and Gordon 2 have similarly summarized the chief 

 human staphylococci as follows : 



1 Lancet, 1906, September 15, 22, and 29. 



- Local Government Board Medical Officer's Report ', 1905-6, p. 558. 



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