140 



INDEX. 



Silicate of magnesia, anhydrous, 24, 

 25. 



, hydrous. See Serpentine 



minerals. 

 Silurian period, calcareous deposits 



of, 86. 

 Siphonotreta, spines of, containing 



glauconite, 6. 



Six, A., on " Eozoon" xlvi. 

 Skye, Isle of. See Isle of Skye. 

 Slaty cleavage, 107, 109. 

 Sleat (in Skye), Post-Cambrian 



metamorphics of, 33. 

 Smaragditje, 7. 

 Smyth, Warington W., on "Eozoon" 



xx. 

 Snarum (Norway), peridote of, 63, 



65. 

 Sollas, Prof. W. J., on Bristol dolo- 



mitic conglomerate, 121. 

 Solvents or solutions, their dissol- 

 ving or wasting action on crystals 



&c., 25, 26, 34, 35, 51, 53, 65, 



79, 80. 

 Solway red sandstones, their position 



in the Permian system, 102. 

 Sorby, H. Clifton, on dolomitization 



of Permian magnesian limestone, 



91. 



, on liquid cavities in metamor- 

 phics, 34. 



, on slaty cleavage, 109. 



South Pole, its proximity to the 



earth's volcanic girdle, 117. 

 Shetland in relation to the 



earth's volcanic girdle, 117. 

 Spadaite a serpentine, 5, 44. 

 ' Spanish Geology, Notes on,' 29. 

 Spezzia (Central Italy), Alberese 



limestone near, ophitized by dykes 



of euphotide, 42. 

 Sphene in hemithrene, 7, 55. 

 Spinel in ophites &c., and its inti- 

 mate association with eozooual 



structures, xxiv, xxv, 7. 

 Spitzbergen under genial climatal 



conditions, 116. 

 Staurolite, pseudomorphic after an- 



dalusite, 23. 

 Steatite, 5, 55. 

 Stevenson, Prof. J., on Ammonites 



&c. of the Rocky Mountains, 



102. 

 , on*" horizontal benches" of the 



Alleghanies, 113. 

 Straits of Belle Isle, calcareous Aca- 



dians of, 84. 



Stratal disturbances of the earth's 



crust, 109-112. 

 Strathdon (Scotland), marbles of, 



89. 



Striping of feldspars. See Feldspars. 

 Studer, Prof. Bernard, on metamor- 



phisrn &c., 31, 32. 

 ' Study of Rocks,' Rutley's, 40. 

 Stylolitic structure in rocks, 12. 

 Sullivan, Dr. (Pres. Queen's Coll., 



Cork), on origin of sepiolyte of 



Vallecas, 29. 

 Sulphuric acid, the part it plays in 



methylosis, 93. 

 Summer-day of sunlight in Arctic 



regions, 116. 

 Sunderlaud (Durham) coralloidal 



limestones, xviii, xix, 93, 102, 118, 



119. 

 Sutherlandshire, Lower Silurian me- 



tamorpbics of, 33. 

 Swamp-cypress. See Taxodium. 

 Swinaness (Unst), altered rocks of, 



38. 

 Symes, R. Glascott, on crystalline 



limestones of Mayo, 90. 

 Synersk (Ural), peridote of, 62. 

 Systemal periods, 100. 



T. 



Tabergite a serpentine, 5. 



Taimyr peninsula in relation to High 



Asia, 112. 

 , its climate and vegetation, 



116. 

 Talc a hydrous mineral occurring in 



granite, 5, 34. 



Talc-gneisses or protogines, 2. 

 Talc-schists, 2, 62. 

 Tarbert (Harris) graphic granite, its 



presumed organic structure. See 



Granite, graphic. 

 Taunus slate alkaliferous, 31. 

 Taxodium (swamp-cypress) accli- 

 mated to Arctic conditions, 



116. 

 Terraces of mountains, their relation 



to changes of ocean-level, 113, 



114. 

 " Thalassa and Xera in the Permian 



period," 99-106. 

 Thermophyllite a serpentine, 5. 

 Thibet, terraces of, 114. 



