Variation 



202 



Variation: of Actinomyces, IV. 15; V. 158. 



- of Azotobacter chroococcum, IV. 114, 

 120, 141, 142, 299, 300; V. 95; VI. 4, 5, 

 22. 



- oiBacteriumprodigiosum, IV. 333, 338. 



- of Chlorella variegata, IV. 231-238. 



- of lactic acid bacteria, IV. 67, 68, 70, 

 74-76, 286, 287; V. 104. 



- of Saccharomyces, III. 174-180, 181, 

 264, 289, 290,292; IV. 40. 



- of Schizosaccharomyces, III. 257, 260, 

 263-265, 266, 270*, 278, 279, 283, 284; 

 IV. 40, 41, 287, 330, 331. 



- orthogenetic, IV. 339, 340, see also: 

 Mutants in experiment and nature. 



- physiological, see : Species, physiolo- 

 gical. 



- pluricellular, III. 230; IV. 52, 311. 



- prevention by colony selection, IV. 

 40-47. 



- prevention by drying on high tem- 

 perature, III. 257, 260-262, 279-281, 

 285, 287-289; IV. 89. 



- prevention by frequently transferring, 



IV. 44, 45, 333, 334, 338. 



- prevention by pasteurising, IV. 89. 



- progressive and retrogressive, IV. 43, 

 76, 336-340; V. 158. 



- qualitative, III. 229; IV. 336-340. 



- quantitative, III. 229. 



- replacing, IV. 43. 



- significance of the study of asexual 

 organisms, III. 165; IV. 37-47, 235; 



V. 28. 



- ,,Sprungweise", IV. 233; V. 25, 26. 



- temporary, see: Modification. 



- theoretical observations, II. 8, 288; 



III. 179; IV. 40, 46, 47, 340; V. 25-29, 

 see also: Mutation, concept. 



- unicellular, III. 228-230; IV. 52. 

 Variegation: I. 342; III. 307-310, 312*; 



IV. 231-238; V. 59-61, 86*. 



- as a virus disease, III. 307-310. 



- compared with gummosis and gall 

 formation (morphogenetic substances), 

 I. 342, 345. 



- transported by grafting only, I. 342; 

 III. 299, 306-309. 



Vesce: see Vetch. 

 Veranetz, IV. 293. 

 Vetch (Vesce), IV. 259, 260. 

 Vibrions: II. 201, 243, 269; V. 121, 201, 

 205, 210, 215. 



- thiosulphate reduction by, IV. 203, 

 204. 



Vijg: see Fig. 



Vine (Wijnstok), I. 23, 61. 



Vinegar: beer , III. 272, 273, 275, 277. 



- manufacture, III. 272, 276, 277. 

 Vinegar bacteria, see : Acetic acid bac- 

 teria. 



Violaceus bacteria: II. 333; IV. 197; V. 

 243-245. 



- accumulation, V. 244, 245. 



- conditions for the pigment formation, 



II. 333; V. 243-245. 

 Virginea plum, V. 172. 



Virulence, II. 201, 341, 343, 344; III. 303; 



IV. 260; V. 31, 186, 216; VI. 17-19, 76. 

 Virus: III. 296-312, 323, 324; V. 137- 



139; VI. 16-18. 



- as the cause of variegation, III. 307- 

 310. 



- compared with gall producing sub- 

 stances, III. 298, 301. 



- mosaic, diffusion, solubility and ul- 

 trafiltration, III. 297-299, 323, 324. 



- mosaic, hibernation, resistance to 

 drying. III. 303. 



- mosaic, inactivation by boiling, III. 

 304. 



- mosaic, influence of formalin, III. 

 304-305, 307, 308. 



- mosaic, multiplication and transport 

 in the plant, III. 297, 300, 301. 



- mosaic, precipitation with alcohol, 



III. 303. 



- size of the particles, VI. 16, 17, 19. 

 Viscoplasm, V. 39. 

 Viscosaccharase, an exoenzyme with 



synthetic action, (Saccharolaevulana- 

 se), IV. 341 ; V. 96, 239, 255; VI. 6. 



Vital staining, V. 116-118. 



Vitalism, III. 157-159. 



Vivipary, II. 102. 



Vlas: see Flax. 



Vlinder: see Butterfly. 



Volatile oils, significance for the plant, 

 III. 327, 328, 341. 



Volcanic ashes of Krakatoa: I. 367-369. 



first life on, IV. 108, 127. 



W 



Walking stick insect (Wandelende tak), 

 I. 296. 



Wall substances of bacteria, see: Slime, 

 bacterial. 



Wandelende tak, see: Walking stick in- 

 sect. 



' 



