COLON-AEROGENES GROUP OF BACTERIA 



283 



Methyl red nagatlirs 



Vogss i.proslcauar pasltlvs 



V. ?. Re»otl3n 



58 45 35 25 15 ^ 



Mathyl rad poaltWa 



Vogas 4 Prosltausr negatlTo 



(i<) Witts psptooa. 5 day3 at 37» 



(3) Synthat.sedluai. 5 days at 37* 



(2) Uitta paptona. 5 days at 24° 



(1) 3ynthat.iadi.us. 5 lays at 34* 



7.2 7.0 6.8 6.6 6.4 



.0 5.8 5.6 5.4 5.2 5.0 4.B 



Chart VII. Showing Symbiotic Reactions op One Strain op B. coli With 

 56 St'rains of B. Aerogenes 



DIFFERENCES IN NITROGEN UTILIZATION AS A BASIS FOR DIS- 

 TINGUISHING B. COLI FROM B. AEROGENES. THE 

 » URIC ACID TEST OF KOSER 



The selective action of bacteria on carbohydrates has long 

 been^recognized, and on this principle many tests have been 

 devised, and different types of bacteria have been successfully 

 separated. The differentiation rests, however, on the character 

 of the end products of carbohydrate fermentation, as for example 



