BY K. GREIG-SMITH. 807 



Lactose: ^xe finally produced acid and gas. 



Milk: Bj4 and B^, ultimately produced acid and clot; B^g 

 produced acid. 



Saccharose: B,, B^^, B, 5 and B^ g produced acid and gas, while 

 Bjg developed acid. 



Thus the races originally twelve in number were reduced to 

 eight. 



Summing these changes together, it becomes obvious that the 

 bacterial activity towards dextrose and mannit is the most per- 

 manent of all the characters; then com.e the actions upon lactose 

 and neutral-red, next the motility, followed by the action upon 

 milk, and the growth upon gelatin; and finally, the most easily 

 restored character is the fermentation of saccharose. 



