49 



186. Bacillus typhosus: good growth; vigorous evolution of gas on 



addition of acid; nitrate content greatly diminished; 



Strong formation of nitrite. 



187. Bacillus para-typhosus: moderate growth; slight evolution of gas 



on addition of acid; nitrate content not greatly diminished; 



Weak formation of nitrite. 



188. Sarcina ventriculi: fair growth; moderate evolution of gas on 



addition of acid; nitrate content considerably diminished; 



Moderate formation of nitrite. 



189. Bacillus violaceus: moderate growth; fair evolution of gas on .ad- 



dition of acid; nitrate content slightly diminished; 



Weak formation of nitrite. 



190. Azotobacter vinelandi: good growth; moderate evolution of gas on 



addition of acid; nitrate content considerably diminished; 



Weak formation of nitrite. 



191. Micrococcus viticulosus: moderate growth; slight evolution of gas 



on addition of acid; nitrate content not greatly diminished; 



Weak formation of nitrite. 



192. Bacillus viridis: good growth; vigorous evolution of gas on ad- 



dition of acid; nitrate content greatly diminished; 



Strong formation of nitrite. 



193. Bacillus aquatile villos: moderate growth; slight evolution of gas 



on addition of acid; nitrate content slightly diminished; 



Weak formation of nitrite. 



194. Bacillus vivax: fair growth; no evolution of gas on addition of 



acid; nitrate content unchanged; 



No formation of nitrite. 



195. Spirillum volutans: good growth; moderate evolution of gas on 



addition of acid; nitrate content slightly diminished; 



Weak formation of nitrite. 



196. Bacillus proteus vulgaris: good growth; vigorous evolution of gas 



on addition of acid; nitrate content greatly diminished; 



Strong formation of nitrite. 



197. Bacterium xanthochlorum: good growth; moderate evolution of 



gas on addition of acid; nitrate content slightly diminished; 



Weak formation of nitrite. 



198. Bacillus xylinum: good growth; moderate evolution of gas on 



addition of acid; nitrate content slightly diminished; 



Weak formation of nitrite. 



199. Bacillus proteus Zenkeri: good growth; moderate evolution of gas 



on addition of acid: nitrate content slightly diminished; 



Weak formation of nitrite. 



200. Bacillus Zopfii: scant growth; no evolution of gas on addition of 



acid; nitrate content unchanged; 



No formation of nitrite. 



201. Boden I (Tsiklinsky-Sudpolar expedition, 1903-5): good growth; 



vigorous evolution of gas on addition of acid; nitrate content 

 greatly diminished; 



Strong formation of nitrite. 



