26o 



SULPHUR BACTERIA 



Hydrogen-ion concentration, 44-46. 

 Hydrogen sulphide, assimilation of, 

 46-47. 



— — equilibiium in water of, 29-33. 



Inorganic sulphur compounds, reduc- 

 tion of, 22-23. 

 Intimate structure of the cell, 176-192. 

 Irritability, 193-205. 



— and en\'ironment, 209. 

 Italy, 6. 



Jamaica, 5. 

 Japan, 6. 



Light absorption, effect of colour on, 



199. 

 • — directive effect of, 194, 205-206. 



— Engelmann's investigations, 195-196, 



198-202. 



— function of, 204. 



— influence on coloured sulphur 



bacteria of, 194. 



— photosynthetic effect of, 194, 207. 



— phototactic, effect of, 206. 

 ■ — tonic effect of, 194. 

 Limans, the, 25, 58. 

 Lime-bacteria, T49. 



Metabolism of the sulphur bacteria, 



34-46- 

 Methods of investigation, lo-ii. 

 Mineral matters, 43-44. 

 Motility, 12, 70, 77, 159, 178, 179. 

 Movement, effect of chemicals on 



direction of, 207-209. 



Natural classification, principles of a, 



67-69. 

 Nitrogen, source of, 60. 

 Nucleus, rgi. 



Organic matter, 38. 



— — in sulphur waters, 50-52. 

 Oxygen, 41. 



— liberation from purple bacteria on 



exposure to light, 201, 203. 



Pffffer's capillary tube method, 194. 



Phi lot/lion, 24. 



Photokinetic after-effect, 196. 



— induction, 196. 

 Photosynthesis, 204. 



Phylogeny ot the sulphur bacteria, 



226-231. 

 Physico-chemical speculations, 50-52. 

 Pleoenergism of the sulphur bacteria, 



47- 

 Pieomorphism, 12-19, 74, 77, 99, i47- 



— author's investigations. 17-19- 



— evidence of occurrence, 14-19- 

 Poland, 5. 



Pure cultures, 11, 14. 



— — of Beggiatoa, 57. 



— • — — Thioihrix, 56. 



Purple bacteria, effect of light on, 206. 



— — liberation of oxygen on exposure 



to light, 201-203. 



— — relationship of light to growth, 



203. 



— sulphur bacteria, necessity of HoS 



to, 61. 



— ■ — • — light to, 6 1. 



Pyrenees, 6. 



Reduction of inorganic sulphur com- 

 pounds. 22-23. 



— — sulphates, 22. 

 sulphites, 23. 



— — thiosulphates, 23. 

 Regional rcjuvc7iesccnce, 157. 

 Reproduction, methods of, 98-99, 112, 



119, 156, 230. 

 Respiration in the sulphur bacteria, 37, 



41-43- 

 Rod-Gonidium, 107, 112. 

 Russia, 6. 



Saprophytic bacteria, 4. 

 Sheath formation, 94, 177. 

 Shock movements, 196-198. 

 Buder's researches, 212. 



— — Molisch on, ig8. 

 Siberia, 6. 



Slime formation, 12, 13, igr, 227. 



Spectra, absorption, 236 ct seq. 



Spectro-photometric method of examina- 

 tion, 239-241. 



Spectroscopic examination of the colour- 

 ing matter, 237. 



Spore germination, T^-TJ. 



Sulphate-reducing bacteria, 4. 



Sulphates, reduction of, 22. 



Sulphites, reduction of, 23. 



Sulphur, tests for, 21, 178. 



— bacteria, area of sensitiveness, 213. 



— — attributes used in the classifica- 



tion of, 69-78. 



— — ciliary movements, 210. 



— — classification of the, 67-91. 



— — colouring matter of the, 232-241. 



— — connotation of the term, 3. 



— — culture of the, 53-63. 



— — denitrifying, 48. 



— — distribution in spectrum colours, 



198. 



— — food requirements of the, 34-36. 



— — geographical distribution of the, 



4-7. 



— — intimate cell structure, 176-192. 



— — metabolism of the, 34-46. 

 phylogeny of the, 226-231. 



— — pleoenergism of the, 47. 



— — reaction to light of the, 211. 



— — respiration in the, 37-43. 



