10 



Page. 



Slates 21-22 



Snake river, Idaho 4-5 



Sonometer, organ-pipe 163 



Spoduinene 2, 102 



Springs, hot, at Pagosa, Col. . 7 

 soda, near Fort Worth, 



Texas 15 



salt, in Texas 16 



Squid 175 



Stalactites in Mammolli Cave. 60 



Standards of time 88 



Star-photographs 146 



Staten Island, N. Y., geology 



of 56-58 



Natural Science Associa- 

 tion 67 



Steam, behavior in steam en- 

 gine cylinder 111-114 



pipes, heating surface. .67-70 



Stereoscope 9, 15, 1 18-1 20 



Brewster's theory of 9 



Helmholtz' views on . ..13-14 



notes 1 1 4-1 18 



St. Eustatius, W. 1 23 



Stone implement fromWaynes- 



ville, N. C 85 



perforated, from Europe. . 49 

 Submarine tunnel between 



England and France.i 55-1 58 



Subsidence and elevation. . .22-24, 



26, 28-29, 66, 100 



Sugar, maple, sap-sand 167 



Sulphur deposits in Utah and 



Nevada 168-175 



Sun-photographs 145 



Talc schist 56-58 



Tellurium, in copper products 



from Col 4 



Temperature, Mammoth Cave 59 

 Terrestrial molluscs in the 



West Indies 181 



Tertiary strata 21-22 



Testing iron and steel, commis- 

 sion for 149 



safety of kerosene oil 

 138-143 



Page. 



Texas, coal 1 5-16 



copper region 1 5-20 



gypsum 17 



pumice-tuff 52 



Thin sections of rocks. .49-53, 154 



Thymole sulpho-acid 3 



Tides, high, erosion by 80-85 



Time-system, international. .86-95 



Tourmaline 2, loi 



Trachyte 19, 23, 169 



Transformation of peat 71-76 



Tremolyte 58 



Triassic strata 20 



Trilobite . . 7 



Tripoli interstratihed with vol- 

 canic ashes 55 



Tubercular disease, prevention 



of 181 



Tunnel between England and 



France 155-158 



Turba of Brazil 76 



Utah, sulphur-deposits.. . . 168-172 



Ventilating chimneys 67-70 



Virginia, Southwest, mineral 



resources of 1 59-163 



Virgin Is., W. 1., breccia 21 



Volcanic ash 23, 49-56, 169, 



171-172 



Wagon Wheel Gap, Col 7 



Weehawken tunnel, minerals 



129-131 



West India Islands, distribu- 

 tion of terrestrial mol- 

 luscs 181 



geolog)' 21-24 



Whale captured off Montauk. 147 

 Wichita Mountains, Texas.. 19-20 

 Williamsbridge, N. Y., pot 



holes 181-183 



Witchcraft excitement, ex- 

 planation of . 150-153 



Yellow Day (Sept. 6, 1881), 



atmospheric phenomena i 

 Zero-meridian for standard 



time 93-94 



Zonites, new species of 181 



