198 



INDEX 



Went and Prinsen Geerligs, on Aspergillus 

 yeast, 176. 



Wertheim, on gonorrhoea, 181. 



Wheat, minimum, optimum, and maximum 

 temperatures for germination of, 74 ; 

 percentage of nitrogen in, 74. 



Wine, cause of sweetness of, 132 ; influence 

 of bacteria on acidity of, 114 ; lactic fer- 

 mentation of, 120; mucilaginous fermen- 

 tation of, 123 ; — yeasts, races of, 129. 



Winogradsky, on fixation of N by soil 

 bacteria, 96, 1 74 ; on iron bacteria, 69, 

 142; nitrifying bacteria, 104, 175; — 

 plate-culture of, 105 ; retting bacteria, 

 177 ; sulphur bacteria, 65, 172. 



Wittlin, 173. 



Wladimiroff, on antitoxin and tetanus 

 poison, 184. 



Wolffhiigel, on bacteriological analysis of 

 water, 171. 



Wollny, on humus, 175. 



Woronin, on bacteroids of root-nodules, 

 90; on root-nodules, 174. 



Wortmann, on pure yeasts, 178. 



Wounds, aseptic treatment of, 87 ; healing 

 of in plants and animals, 145 ; non- 

 dangerous character of in plants, 138. 



Xanthoria parietina, 93, Fig. 20. 



Yeasts, 126 seq. ; colonies and spores of, 

 127, Fig. 25 ; sterilization of, 120; in- 

 fluence of heat on sporulation of, 129 ; 

 literature of, 178; wild varieties of, 

 131; variations in, 178. 



Yersin, on antiseptics, 173. 



Zoogloea, formation of, 3 ; characters of, 4. 



Zoogloea ramigera, 4, Fig. 3. 



Zopf, on life cycles of bacteria, 29 ; on 



pleomorphism in bacteria, 170. 

 Zymase, 179. 



THE END 



