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, V. 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. 



- role of ammonium carbonate, IV. 88, 

 91. 



V 



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. 



- fluctuating, 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. 



