SUMMER DIARRHCEA 163 



methods of classification which had been adopted. Lewis (191 1) classified the bacilli 

 he isolated into groups according to their actions on the fermentable substances used. 

 O'Brien (191 1), Ross (iqi i), and Orr (191 1) used the same general classification. 



" With the concurrence of Dr Lewis and Dr Moore Alexander this classification has 

 l)een amplified, each group being divided into sub-groups in such a manner that all 

 the known organisms can be tabulated and compared, and those subsequently 

 discovered can be added in their proper places. The scheme may be readily 

 comprehended from the following table." 



TABLE 18. Shozviiig tJie method of classifying bacilli zvJiicJi do 

 not ferment lactose or liquefy gelatin into Groups and Sub- 

 groups according to tJieir fermenting properties. 



A = Acid. A-fG = Acid and Gas. = No change. 



* = Described Sub-group. 



