GENERAL INDEX 



261 



Sulphur cycle in nature, the, 7-10. 

 — waters, organic matters in, 50-52. 

 Sulphuretted hydrogen, 38. 



natural sources of, 20-29. 



production of, 20-29. 



— under marine conditions, 



24-29. 

 Sweden, 6. 



Thionic acid bacteria, the, 3, 220-226. 



nomenclature of the, 226. 



Thiosulphate bacteria, 3. 



Thiosulphate bacteria, denitrifying, 3. 

 Thiosulphates, reduction of, 23. 



United States of America, 6. 



Water, changes effected by T. volnians, 



63- 

 West Galicia, 7. 



ZooGLOEA condition, 13, 15, 

 Zoospores, 120. 



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