XVI 



Page 



Specializations of sex in insects 103 



Sphalerite 23, 49 



Sphenophyllum, dimorphous 



foliage 46 



Spherostilbite 18 



Spinel 21 



Spitzbergen, climate of 85-87 



St. Acheul, Palaeolithic arrow- 

 heads 81-82 



Staten Island, N. Y., carved 



head found in 81 



leaf-bearing sandstones. 30-31 



minerals 49-50 



Steamboat, first, on Lake Su- 

 perior 13 



Sterility of ants and neuters . 103 

 Stoneham, Me., herderite. . . 37 

 Stone implements at Trenton i, 



7-12 

 Striae, glacial, on Shawangunk 



range 27-28 



Succession of animal life .... 20 



of forest growths 36 



Sugar-beet, cultivation of . . 5-6 

 cane crop, soil exhaustion 



by 15-16 



from sorghum 5"^ 



Sullivan County, N. Y., mo- 

 raine deposits 25-26 



Survey at Lake Mceris 78-79 



Teliosts of the Cretaceous 



period 54 1 



Terraces on Shawangunk 1 



Mountain 27 | 



Tertiary climate in Arctic re- | 



gions ; 94 



plants, found in Colorado 13, 



11 '^ 

 plants, present range of. 96 

 Thames River, England, water 



of 42 



Theory of the origin of leaf- 

 forms 38-44 



Tideways of Puget Sound, 



origin of 104 



Topaz 2, 13, 37 



Topography of Egypt 78-79 



of North America 51-52 



Tornadoes 3-5 



Tourmaline 34, 49 



Page 

 Trance state, artistic uses of. 107 



Treasurer, Report 69 



Trees, planting and destruc- 

 tion of 35-37 



Tremolite 49 



Trenton, N. J., stone imple- 

 ments at I, 7-12 



Triassic copper ores 18-19 



Tyringham, Mass., sphero- 

 stilbite and chabazite. .' 18 



Uniformity of geological cli- 

 mate 84-97 



Utah, luminous limestone ... 100 



Vanadite 100 



Venation of leaf, relation to 



marginal forms 41 



Vermont marbles loo-ioi 



Virginia, minerals from. . .77, 100 

 Volcanic ashes in Yellowstone 



Park 6 



ashes, microscopic exam- 

 ination of 14, 63-64 



dust of Krakatoa, diffu- 

 sion of 60-61 , 64-65 



Warm Arctic climate, ancient 



84-86 

 Wahsatch Mountains, Utah, 



copper ores 19 



Water, carbonic acid in 42 



of river Thames, Eng- 

 land 42 



Waterspouts in Caribbean Sea 3 



Wavellite 18 



Wire, corrosion of 65-66 



Wood-sections, photomicro- 

 graphs • 107 



Wood, silicified, in Colorado. 6-7, 



13. 11 

 Wyoming, fossil fishes from. . 34, 



38 

 minerals from . .7, 19-20, loi 



Yellowstone Park, Col., geol- 



j ogy, botany, etc 34 



geysers and rhyolyte .... 7 



Zeolites i, 78 



Zircon 17. 107 



