V KICKS.] 
PKTKOLOGY, AND MINERALOGY FOR 1892-1900. 
51 
hemical analyses— Continued. 
Syenite, Kemp, 2993. 
Syenite, Pirsson, 4408. 
Syenite, Turner, 5465, 5466. 
Syenite gneiss, Gordon, 2066. 
Syenite-porphyry, Cushing, 1244. 
Sylvanite, Kobbs,2648. 
Tal<, Smyth, 5090. 
Talcose slate, Nitze and Wilkins, 4109. 
Tellnride ore, Pearce, 4282. 
Tetradymite, Hoffman, 2659a. 
Tetrahedrite, plumbiferous, Hoffmann, 2659. 
Thalite, Winchell, 6363. 
Thaumasite, Penfield and Pratt, 4313. 
Theralite, Clarke and Hillebrand, 925. 
Theralite, Diller, 1507. 
Tnom.sonite, Patton, 4261. 
Tinguaite, Clarke and Hillebrand, 925. 
Tinguaite, Washington, 5872, 5875, 5877. 
Tinguaite, Weed and Pirsson, 5937, 5942. 
Titaniferous iron, Kemp, 2991. 
Titaniferous magnetite, Kemp, 2993. 
Tonalite, Clarke and Hillebrand, 925. 
Tourmaline, Clarke, 927, 930. 
Tourmaline, Penfield and Foote, 1321. 
Trachyte, Clarke and Hillebrand, 925. 
Trachyte, Cross, L191. 
Trachyte, Diller, 1507. 
Trachyte, Kemp, 2993. 
Trachyte. R.uisoine, 4540. 
Trachyte, Turner, 5465, 5466. 
Trachytic rhyolite, [ddings, 2846. 
Travertine, Diller, L507. 
Triphylite, Penfield, 1324. 
Troctolyte, Winchell, 6277. 
Tuff, Cross, L191. 
Tuff, Diller, L507. 
Tuff, Turner, 5465, 
Tuff, Weed and Pirsson 
Turquoise, Penfield, 1326. 
Tyrolite, Tower and Smith, 5445. 
Tysonite, Eillebrand, 2581. 
Tysonite, Hillebrand, 2585. 
Uintaite, Eldridge, 1626, 1627. 
Uralite diabase, Lindgren, 3531 . 
Uranium, Ohly, 4134. 
Vanadiferous sandstone, Hillebrand and Ran- 
som e, 2587. 
Vitrophyric latite, Etansome, 1540. 
Volcanic ash, Barbour, 233. 
Volcanic breccia, Walker, 5825. 
Volcanic dust, Diller, L507. 
Volcanic rock, Andrews, 115. 
Wardite, Davison, 1 111. 
Water, Darton, 1317. 
Wider, Emmons, 1705, 1706. 
Water, Hoffmann, 2659. 
Water, Leverett, 3487. 
Water, Orton, 4169. 
Water, Shephard, 4947, 4948. 
Water, mine, Emmons, 1708. 
Websterite, Clarke and Hillebrand, 925. 
Wehrlite, Clarke and Hillebrand, 925. 
Wellsite, Pratt, 4436. 
Wollastonite, Winchell, 6368. 
Wyomingite, Clarke and Hillebrand, 925. 
Wyomingite, Cross, 1196. 
Chemical analyses — Continued. 
Yogoite, Weed and l'irsson, 5936. 
Yolite, Washington, 5880. 
Zinc ores, Schmitz, 4827. 
Zircon. Diller, 1507. 
Classification. 
Basis of time divisions and classification of 
geologic history, Chamberlin, 838. 
Classification and nomenclature of geologic 
time divisions, Clark, 916. 
classification and nomenclature of geologic 
time divisions, Gilbert, 2008. 
Classification and nomenclature of geologic 
time divisions, Keyes, 3121. 
Classification and nomenclature of geologic 
time divisions, Le Conte, 3132. 
Classification and nomenclature of geologic 
time divisions, Willis, 6211. 
Classification and nomenclature of geologic 
time divisions, Williston, 6250. 
( lassification oi Mississippi .n series Weller 
5990. 
Classification of stratified rocks, Williams, 
6178. 
Genetic classification of geological phenom- 
ena, Keyes, 3124. 
Geological versus the petrographical classifi- 
cation of igneous rocks, Cross, 1198. 
Geology of Erie County, Grabau, 2085. 
International geologic institute, Chamberlin, 
859. 
Rock classification, Iddings, 2837. 
Rules and misrules in stratigraphic classifi- 
cation, Marcou, 3663, 3664. 
Upper Permian and Lower Cretaceous, Pros- 
ser. 1491. 
Use of local names in geology, Keyes, 3120. 
Symposium of classification, Calvin, 716. 
Colorado. 
Acanthite from Colorado, Chester, 878. 
A.dephagous and Clavicorn Coleoptera from 
t lie Tertiary deposits at Florissant, Scudder, 
4900. 
Alunite from Colorado, Hurlburt, 2813. 
American fossil tortoises, Baur, 299. 
A mountain placer, Lakes. 3326. 
Analcite-basalt, Cross, H97. 
Andesite rocks near Silverton, Van Horn, 
6548. 
A new fossil Xelumbo. Hollick, 2(171. 
Anthracite in the Rockies, Hosea, 2760. 
A peculiar clastic dike and its associated ore 
deposits, Ransome, 4544. 
Archean-Cambrian contact, Cosby, 1168. 
Artesian wells of Denver, Van Diest, 1191. 
Asphalt deposits, Lee, 3138. 
A.ustinensis roemer, Cannon, 746. 
Boulder region, Lakes. 3345. 
Calaverite crystals from Cripple Creek, Pen- 
field, 4310, 
Calaverite from Cripple Creek, Hillebrand, 
2575. 
Canyon City to Colorado Springs, Emmons, 
1693. 
Carnotite and vanadiferous minerals in west- 
ern Colorado, Hillebrand and Ransome, 
2587 
