GENERAL INDEX. 



303 



Scapolite 75 



Scenery, Staten Island 228 



Schistose rocks in Adirondacks 73 



Seal, of Academy 232 



Sea-serpent 1K5-168 



Sedimentary strata, origin of, 



in America 78, 79 



Self-fluxing iron ore 221 



Serpentine, Staten Island.. .. 228 



Shawangunk grit 216 



Signals, railway 149 



Significance of flora to Iro- 

 quois 202 



Siliceous sponge from L. I 120 



Silicitied forest in Arizona 9-11 



Silurian, lower strata 216, 220 



Silver, action on ozone 185 



in pyrites 192 



ores and mines, in Col. 122-180 



Sirius 184 



Slate, black, in San Juan Mts. 



123, 129 



near Nat. Bridge 218 



Soda, production of 193, 193 



Sodium. .179, 186, 187, 193, 214, 215 



in comet 254 



nitrate of 214 



peroxide of , 314. 215 



Solar parallax 238-389 



prominences 244, 245 



spectrum 242-244, 245 



system, evolution of 249 



Solidification of fluids 191 



Sorghum ] 94 



Spectra of comets 254 



of stars 359 



of sun 242-344 



of suQ-spots 242 



Spessartite, from Col 213 



Sphene 77, 264 



Spinel, from Cevlon 335 



Spots, on the sun 339-343 



Standard time 336 



Star garnets 335-336 



Stars 357-360 



catalogues of 357-358 



double 3(30 



parallax of 359-360 



photographs of 358 



photometry of 358-359 



spectra of 259 



variable 259 



Staten Island 338-330 



nsbestos 339 



azoic rock 228 



PAGE 



Staten Island, cretaceous 



plants 28-29 



minerals 228-230 



serpentine 238 



steatite 228 



Steam engine, develoijinent of, 



137-143 



Newcomen's 137-138 



Savery's 137 



Watts' 138 



Steatite, Staten Island. . 238 



Suberone 196 



Sulphides, of silver, etc 128 



Sulphur 195 



dioxide of 185 



Sulphuretted hydrogen 187 



Sulphuric acid 186, 187, 192 



Sun.... 238-247 



and meteorology 239 



atmosphere of 240 



corona of 345-347 



chromosphere of 245 



distance of 338-239 



eclipse of 245-246 



heat of 240-241 



parallax of 238-239 



prominences of 344-245 



spectra of 242-244 



surface of 339-243 



Sun-spots 239-342 



spectra of 242 



Surface of sun 239-243 



Synclinal fold, in Page Val- 

 ley 216 



Synthesis, chemical 197 



Tails of comets 254-255 



Talc 229 



Temperature, effect on chemi- 

 cal changes 186-187 



lowest measured 191 



Temple and palaces of Yuca- 

 tan 169-178 



Ten years' progress in astron- 

 omy 234 



Tertiary age 133 



Theories, etc., of virus 204-213 



Thermo-chemistry 189 



Thioi)hene 195 



ThuUum 181,200 



'• lide- water " gneiss 19-20, 333 



Ties, iron, railway 153 



Timber, decay in 110-130 



Time-rate in chemical affin- 

 ity 188-189 



