173 



Iron salts 



Hydrogen : production by Sarcina ventri- 



ctili, IV. 279; V. 13. 

 — production in cellulose fermentation, 



IV. 253, 257. 

 Hydrogenase versus catabolic action, IV. 



204. 205. 209. 

 Hydroplasm. I. 393. 

 Hyperplasism, I. 10. 

 Hyppö. II. 210. 



Idioplasm. IV. 47. 



Iep: see Elm. 



Imbibition. V. 24. 



Immunity and enzymes, V. 257. 



Inbreeding, IV. 237. 



Indian cress (Capucine, Kapuzinerkresse) 



III. 275. 327. 328; IV. 23. 

 Indican: biological significance, III. 341. 



— decomposition by microorganisms, 



III. 330. 337. 343-347; IV. 6. 101. 285; 

 V. 108. 



— decomposition. catabolic versus en- 

 zymatic. III. 329. 337. 344. 345; IV. 

 6. 30, 101. 



— distribution in the indigo plants, III. 

 340, 341. 



— formation of glucose from. III. 344, 

 346. 347; IV. 6. 29. 



— microchemical de monstra tion, III. 

 342. 



— preparation. III. 330. 337. 338; IV. 6. 



— reaction of lactic acid bacteria, III. 

 344; IV. 285; V. 108. 



Indican microorganisms, III. 343-345; 



IV. 29-31. 



Indican plants, III. 330. 332. 



Indicase, IV. 101, see also: Enzymes. 



indigo. 

 Indiglucin, IV. 2. 9. 

 Indigo: as a reagent on oxygen. II. 201. 



204. 234. 235. 246. 302. 304; III. 73. 



77. 88. 



— demonstration in the plant, III. 333. 

 335; IV. 11, 12. 



— enzymes. see: Enzymes. indigo. 



— fermentation. catabolic. by Aerohac- 

 ter, III. 329, 337-344-347-350; IV. 

 29-31. 



— plants, III. 330-334; V. 247. 



— preparation from Isatis, III. 329-336; 

 IV. 1-12. 



Indigo blue: III. 331. 342. 345; IV. 7, 29, 

 192. 196. 



Indigo blue : reduction by microorgan- 

 isms. II. 151, 246, 331, 337, 352; III. 

 88; IV. 192, 196. 



Indigo red, III. 332, 342, 346; IV. 7. 



Indigotin, II. 337. 



Indol reaction, III. 18-20, see also: 

 Cholera. 



Indoxyl: III. 330; IV. 1, 4-1 1. 



— oxidation, IV. 10. 11. 

 Influenza bacillus, III. 168. 

 Infusions: V. 119-140. 



— of Leeuwenhoek, V. 121-127. 



— of nature, V. 139, 140. 



— ofNeedham and Spallanzani, 

 V. 128, 129. 



— of Pasteur, V. 129-133. 



— successive organisms in, V. 119. 

 Inquilins, I. 6, 14, 44, 59, 76. 80*. 135, 



136. 137, 138, 153, 158, 160, 173, 174, 

 177, 237, 238, 253; II. 4, 167; III. 204. 

 227; VI. 53. 



Intestine, bacterial flora, II. 217; IV. 28. 

 56, 293-296. 



Intramolecular respiration: see Fermen- 

 tation. 



Inversion of sugars, II. 214; III. 183, 

 275; IV. 21, 60. 72. 



Invertase: II. 213. 218, 242, 279; III. 13, 

 153; IV. 285; V. 40, 89, 92, 96, 106, 

 206, 250, 273; VI. 4, 13, see also: In- 

 vertine. 



— destructive temperature, III. 153. 



— reaction of lactic acid bacteria, IV. 285. 

 Invertine, II. 172. 213. 216. 224, 279- 



281; III. 164; IV. 21, 29; VI. 78. see 



also: Invertase. 

 Involution forms of bacteria, IV. 114, 



120. 124*. 

 lodine reaction on: glycogen, III. 284. 



— granulose, III. 284. 



— yeast spores, III. 257. 



Irisation phenomenon : demonstration of 

 alkali production, IV. 144, 146. 



— demonstration of urea decomposition 

 and urease, IV. 80, 83-85, 91-93, 96. 

 98, 102; V. 246, 247; VI. 20. 



— demonstration of sulphur production, 

 IV. 29. 



Iron bacteria, V. 142. 



Iron salts: as a reagent on sulphides in 

 bacterial cultures, IV. 196. 197. 210. 



— influence on chromogen production, 

 IV. 122, 124; V. 259. 262. 263; VI. 22. 



— organic, reduction by microorganisms, 

 IV. 196, 197.210. 



