1280 



INDEX. 



Page. 

 Soda in grain and straw 454 



Soda in rooks of various kinds . 997 



Soda in salts of sea water 942 



See also Sodium oxide. 

 Sodalite, alterations and alteration products of .. 295-297, 

 374,392,398,403 



chemical and physical constants of - 200,295 



occurrence of 29o 



source and mode of formation of . . 294, 295, 372, 388, 400 



Sodium, in earth's crust 934,936,990-997 



in sea salt and in the ocean ._ - 943,944 



minerals and rocks containing- _ 997, 999 



occurrence of 990-999 



Sodium-bearing minerals, deposition of .. 627 



Sodium carbonate, hydrolysis of 86 



presence of, in soils 543 



reaction of, with zinc carbonate on iron sul- 

 phide, equation showing - 1143 



reversible reaction of, with magnesium sul- 

 phate.. - 88 



solubility of sulphides in .. - 1108 



Sodium chloride, deposits of - 789-790,979 



in sea salt and in the ocean 943 



in soils. - °4^ 



removed from soil annually- -- 486 



Sodium minerals, order of decomposition of, in 



rock weathering 536 



Sodium oxide, in earth's crust 934,937,938 



in salts of sea water - 942 



Sodium silicate, alkaline reaction of in solution 86 



hydrolysis of - 67 



Sodium sulphide, action of sulphuric acid on, equa- 

 tion showing 1176 



solubility of sulphides in 1106,1108 



Soils, alkaline deposits in, prevention of ... 546 



alkaline deposits in, effect of on agriculture 543 



calcium in, agricultural benefits of. 92 



carbon dioxide in, amount of 474 



chemical composition of 891 



concentration of minerals in, by ground water. 544, 550 



effect of agriculture on. - 451 



effect of freezing on 443 



maintenance of, by plants and animals 111 1 51 



456-157, 504-506 



materials abstracted from, by plants 537-538 



number and surface area of grains of 496 



of arid regions, composition of 497-498 



salts (soluble) contained in, amount of 545 



soluble material in, as effected by comminution. 495 



Solfataras, alums produced by 493 



chlorides produced by 493 



gases emitted by, sources of 491-492 



metamorphic work of -- 490-494 



productsof 493-194 



Solid solutions, formation of -- 59 



Solids, precipitation by reactions between solutions 



and 120-123,1086-1088 



solution of, in groundwater 72-81 



Solids and liquids, gradations between.. 81 



Solids held in solution, effect of on absorption of gas 



by water, of solution 72 



Sollas, W. J., on cherts of organic origin 847 



Solubility, relations of, to absortion and liberation 



of heat 81 



relations of , to pressure 77-79,80,101 



to temperature 79-81 



See also Solution. 



Page. 



Solution, definition of 72 



discussion of. 484-487 



heat of , defined.. 105 



extent and importance of, in belt of weather- 

 ing 163,164,165 



in belt of cementation 612-617 



materials transported in 557-558 



promotion of, by pressure 77-79,101 



quantitative relations between deposition and . 613 



quantity of material that may be held in 79-81 



relations of, to absorption and liberation of heat SI 



to pressure 77-79,101 



to temperature _ 79-81 



speed of, as affected by temperature 79 



volume change resulting from 78 



Solution and decomposition, relations of, to disin- 

 tegration^ 494-507 



Solution and deposition in zone of anamorphism . 680-681 

 Solution and suspension, materials transported 



in 558 



Solutions, aqueous, circulation of 1021-1029 



aqueous, formation of 59 



metamorphic work of 63-158 



precipitation by reactions between 1 16-1 17 



source of water of 1065-1069 



ascending, compounds deposited by.. 1088-1132 



ores precipitated from 1072-1139,12.34,1235 



ascending and descending, ores precipitated 



from ---. 1193-1199 



chemical action through, definition of 66 



chemical composition of, importance of. 359 / 



chemical work of , in belt of weathering 457-461 



circulation and work of 1017-1030 



composition and properties of - 58-59 



gaseous, circulation of.. 1018-1021 



formation of 59 



metamorphism by 59-63 



mineral species present in, advantages held 



by 122-123 



minerals now in course of deposition by 1059-1060 



mingling of, precipitation of metals by 1082-1085 



mixture of, heat phenomena produced by 106 



ores deposited by 1058-1234 



metals of , sources of 1069-1072 



modification of, by gaseous solutions 1239 



precipitation by reactions between solids and. 120-123 



precipitation of abundant compounds in 539 



principles of, applicable to ground waters 65-83 



saturated, crystallization from 74-76 



solid, formation of. 59 



solubility of, increase of, with increase of heat. . 116 



strength of, a factor in metamorphism... 94-95 



water of, source of 1065-1069 



Solutions and solids, precipitation by reactions be- 

 tween... 120-123,1086-1088 



Sorby, H. C, on enlargement of mineral particles . 644 

 South Moxtntain district of Idaho, ore deposits and 



gangue minerals of 1056 



Spodumene, alterations and alteration products 



of 2S0-281,374,392,397,405,408 



chemical and physical constants of 200,271 



occurrence of ." 273 



Specific gravity of minerals, in different zones of 



metaniorphisin, discussion of 182-185 



influence of, on stability - 360 



of zone of anamorphism 363-364 



of zone of katamorphism 363,364 



