201 



Variation 



Urea bacteria: enrichment culture with 

 sea water, IV. 101, 102. 



— in the praeflora of an enrichment cul- 

 ture of Urobacillus Pasteurii, IV. 82, 

 85, 87, 91-97. 



Urease: IV. 78. 83-85, 89-93, 95-102; 



V. 40, 246, 247, 250; VI. 13, 20. 



— detection by the irisation phenomenon, 

 IV. 83-85, 91-93, 96,98; V. 246. 247; 



VI. 20. 



— in Bacillus radicicola, VI. 20. 



— in Papilionaceae. \. 246, 247; VI. 20. 



— necrobiotic formation, IV. 89, 99. 

 -- no diffusion, insoluble, IV. 98-101. 

 -- occurrence, V. 246, 247, 250; VI. 20. 



— preparation, IV. 97, 98. 



— temperature optimum, IV. 90. 



— versus katabolic action, IV. 97-102. 

 Urease bacteria, V. 246, 247, see also: 



Urea bacteria. 

 Ureolysis, see : Urea decomposition. 

 Urine. IV. 91. 

 Urobacillus leubei: diagnosis. IV. 94*, 95, 



103*. 



— resistance of the spores to alkali and 

 temperature, IV. 94. 



Urobacillus miquelii, description, IV. 87, 



92, 93*, 103*. 

 Urobacillus Pasteurii : autopurification of 



an enrichment culture, IV. 82, 86, 88, 



91, 92, 94. 



— description, IV. 86. 88, 89*. 103*. 



— occurrence, IV. 87, 88. 



— production of alkali, IV. 94. 



— regeneration of the spore forming 

 ability, IV. 89. 



— róle of ammonium carbonate, IV. 88, 

 91. 



Vacuoles: influence of frost, III. 288, 

 289. 



— of Azotobacter, IV. 114, 124*. 



— pulsative, III. 191. 192, 197. 

 Variants: see also Hybrids and: Mutants. 



— and species of Aerobacter, IV. 28-30, 

 32, 36, 146, 159. 



— and species of Bacillus radicicola, II. 

 156. 165, 167, 175-177, 187*, 325; III. 

 49; IV. 260; V. 265-267. 



— sector. III. 284-286; IV. 233. 364. 

 369. 



— selection of rare. III. 286, 289, 292. 



Variants: species and races, I. 359-366. 

 401-407-408, 419; III. 3, 271-273; IV. 

 28, 30, 39, 40, 46, 48-52, 55-59, 115,316; 



V. 36-38, 73, 178. 186-193. 210, 281- 

 288. 



— sub — , IV. 39, 41, 42, 46, 52. 338- 

 340. 



Variation: I. 359. 402-408, 409-414, 

 415-426; II. 8. 101. 131; III. 3. 165. 

 177-181. 208, 228-230, 258, 263, 271- 

 273. 288. 290-292; IV. 89. 149. 231, 

 233, 333-340; V. 25-28, 31, 67, 70, 158. 



VI. 12, 13, 80, 85, see also: Atavism, 

 Degeneration, Hybridisation, and: 

 Mutation. 



— accumulative, IV. 46; V. 26. 



— and amphimixis, V. 28, 66. 67. 



— and polymorphism. III. 179. 264. 

 265; IV. 40. 



— as a function of growth. IV. 45, 46; 

 • V. 30. 



— bud, II. 131, 133; III. 309; IV. 37. 

 48-52. 235, 236. 305-312; V. 25. 



— continuous. V. 26. 



— discontinuous, V. 26. 



— fiuctuating, II. 290; III. 271 ; IV. 233; 

 V. 26. 56. 59. 



— germinative, III. 265, 278, 286, 288, 

 289. 



— hereditary constant, II. 201, 247, 251, 

 292; III. 165. 265; IV. 38.40-46,47, 

 76, 235. 333-340; V. 25, 29. 155. 



— influence of external factors, I. 412; 

 II. 344-346, 357; III. 165, 177, 178. 

 181. 289; IV. 40, 70, 74-76, 286, 287; V. 

 30, 35, see also: Modification. 



— influence of metabolic products, II. 

 344-347, 349; IV. 40, 333, 338, 339; 

 V. 155. 



— influence of nutriment concentration, 

 II. 328. 331, 345-347, 349, 353, 355; 



IV. 38, 339. 



— influence of nutrition, I. 412;II. 291. 

 292; III. 177-181; IV. 40. 234-235. 

 287, 333, 337. 339; V. 28, 30, 35. 



— influence of respiration conditions. 

 II. 346; III. 177. 178. 181; IV. 67, 70, 

 74-76, 141, 142, 148, 149. 286. 287, 

 318, 336. 337. 



— influence of temperature. II. 329. 

 341-345-347. 349, 352; III. 21. 165. 

 181; IV. 38. 67. 70. 74-76. 286, 287, 

 318. 337. 338. 



— no influence of ultraviolet radiation, 



V. 208. 



