Sulphur 



198 



Sulphur : reduction in presence of organic 

 substances, III. 104, 105; IV. 24, 26, 

 29, 33-36, 192, 198, 203-205, 208, 210, 

 247. 



— secretion, III. 109; IV. 29, 197, 202, 

 203, 206, 209, 243, 244. 



■ — separation from the bacteria, IV. 244. 

 Sulphur bacteria, II. 332; III. 39-41; 



IV. 122, 202-211, 242-248; V. 281- 



288; VI. 27. 

 Sulphuretted hydrogen : free oxygen in 



Solutions of, IV. 194. 



— in bacterial cultures, iron salts as a 

 reagent, IV. 196, 197, 210. 



— in bacterial cultures, lead compounds 

 as a reagent, III. 105; IV. 26-28, 33, 

 36, 198, 203. 



— origin in nature, III. 104-108; IV. 

 24-36, 192, 202, 204, 210, 247; V. 283. 



— origin in nature, biogenous processes, 

 theory, III. 106-10Ö. 



-— origin in nature, without biogenous 

 processes, III. 104. 



— production by yeast, III. 105, 106; 

 IV. 24, 35, 203, 204. 



— production from penta- and tetra- 

 thionate, IV. 35, 36. 



— production from proteins, III. 104, 

 105, 106, 318, 320; IV. 24, 29, 33-36, 

 196-199, 210. 



— production from sulphate, III. 104, 

 106-127; IV. 24-35, 197-210; V. 283. 



— production from sulphite, III. 105- 

 106; IV. 24, 35, 201, 203, 210. 



— production from sulphur in presence 

 of organic substances, III. 104, 105; 

 IV. 24, 26, 34, 35, 192, 203, 204, 210, 247. 



— production from thiosulphate, III. 

 104, 105; IV. 24, 35, 201-204, 210. 



— production in canal water, III. 102, 

 111-117; IV. 24-31, 53, 199, 204. 



Suncracks of trees, VI. 59, 60. 

 Sunflower (Zonnebloem), VI. 29, 33. 

 Sunsets, remarkable, I. 367-369. 

 Susceptibility of plants for climate and 



diseases, I. 35; III. 162. 

 Swarm spores: II. 314, 315, 319; III. 22, 



23, 24. 



— formation, influence of the concentra- 

 tion of the nutriënt, III. 22. 



Swarm stage of Bacillus radicicola, VI. 



63-64*-65. 

 Sweet flag (Kalmus), I. 83. 

 Swell in cheese (Rijzers), control, III. 



347; IV. 29, 288; V. 235. 



Sycomore, I. 41. 



Symbiosis: I. 11, 12; II. 1, 181-182, 184, 

 185, 186, 216, 218, 299, 304-310-314- 

 320, 324; III. 24; IV. 111, 112, 118, 

 139, 140-145-154, 159, 164, 165, 175. 

 176, 179, 256-259, 263, 302, 318, 319; 



V. 111-115,181, 182, 190,265-270,280; 



VI. 12. 



— of Algae, II. 304-310-316-320; IIL 

 24. 



— of Lactococcus agglutinans and yeast, 



IV. 319. 



— of the constituents in the grains of 

 kephir, II. 216-218. 



— leading to nitrogen fixation, IV. 111, 

 118, 139-145, 149, 150, 159, 165, 167- 

 170, 176, 256-259, 300-302, 377; V. 

 232, 267, 268; VI. 3. 



— leading to pigment formation, V. 112, 

 113, 280. 



Symbiotic culture method : see anaerobic 



culture, biological methods. 

 Sympodial structure, II. 9, 34. 

 Syneresis, IV. 345. 



Synthetic action of endoenzymes, VI. 14. 

 Synthetic action of exoenzymes, IV. 341 ; 



V. 96, 239, 255; VI. 6. 



Tabac : see Tobacco plant. 

 Tabakspflanze : see Tobacco plant. 

 Tabaksplant: see Tobacco plant. 

 Tanne : see Fir. 

 Tanned leather, V. 24. 

 Tannery: IV. 59. 



— troublesome slime production in, III. 

 274. 



Tannin, IV. 16-19. 



Taraxacum, adventitious buds at inverse 



root fragments, I. 121. 

 Tartaric acid, determination of bacteria 



by means of, III. 32. 

 Tartrates, dissimilation, II. 167, 264; 



III. 32; IV. 113, 145, 299, 354; VI. 21. 

 Tarwe: see Wheat. 

 Tarweaaltje: see Wheat eel. 

 Taschenbergi wasp : heterogenesis, I. 201. 



— oviposition, I. 209. 



Taxonomy of microorganisms, II. 229, 

 296, 301; III. 3, 22, 66, 126, 271, 272, 

 273, 276; IV. 28, 30, 39-42, 55, 59, 

 115, 231; V. 29, 73, 82, 157, 209, 210; 

 VI. 9, 27, 65, see also: Nomenclature of 

 bacteria. 



