INFECTIONS OF THE DIGESTIVE TRACT 201 



formed by organisms of the B. coli group. The gas 

 consists of from one-third to one-half carbon dioxide, 

 the remaining gas consisting mainly of hydrogen. 1 The 



1 Professor Theobald Smith gives the following gas formula for 

 B. aerogenes capsulatus : 



H 2 = 3 

 CO 2 1 2 



The following table illustrates the approximate ratio of hydro- 

 gen and carbon dioxide : 



