21 



TABLE VII 



The development within this medium was especially rapid, 

 the evolution of gas beginning after the second day and continu- 

 ing with increased vigor for some time. In the flasks which 

 contained the gi eater amounts of carbohydrate the evidence 

 of powerful reduction was most pronounced, the surface being 

 rapidly overspread with fusarium and other fungi, which were 

 not apparent on those with lower sugar content. The evolu- 

 tion of gas was so violent in some cases as to force the felt- 

 like growth from the surface, high above the liquid, as il- 

 lustrated in the accompanying figure. The evidence here 

 presented indicates that the reduction of nitrates is carried on 

 with great vigor in the presence of considerable quantities of 

 carbonaceous material. No appreciable difference could be 

 detected in favor of either mannite or dextrose. 



