173 



Iron salts 



Hydrogen: production by Sarcina ventri- 



culi, 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. 

 Hyppo, II. 210. 



Idioplasm, IV. 47. 



lep : 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 demonstration, 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 Aerobac- 

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

 29-31. 



- plants, III. 330-334; V. 247. 



- preparation from I satis, III. 329-336; 

 IV. 1-12. 



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

 192, 196. 



18-20, see also: 



11. 

 168. 



V. 121-127. 



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. 

 Cholera. 



Indoxyl: III. 330; IV. 1, 4-11. 



- oxidation, IV. 10, 

 Influenza bacillus, III. 

 Infusions: V. 119-140. 



- of Leeuwenhoek, 



- of nature, V. 139, 140. 



- of N e e d h a m 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*. 

 Iodine 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. 



