422 



GENERAL INDEX. 



Page. 



Virionia range, King on 25 



Vivian, assay of earlier hornblende- andesite from near 



the... 155 



V^olcanic action as a source of heat at Washoe 231, 238 



Volcano, motamorphic diorite near tho 34, 43 



Wagou Canon, propylite from MO 



Wales Consolidated, granite at the 190 



metaniorphic diorite at the . . .43, 190, 195 



Wall, eaat, impregnation of, von Richthofen on 15 



indistinctness of the 273 



Wall rock, particles of, accompanying ore, von Richt- 

 hofen on V7 



west, relations to slope of Mount Davidson, von 



Richthofen on 14 



Walls of the Lode 207, 393 



lithological character of, von Richthofen on 15 



Waller Defeat shaft <D. 5), analysis of diorite from near. . 



table following page 151 

 assay of porphyritic diorite from 



near 1 54 



Ward, earlier diabase near the 51, 197 



Washoe District, bullion product of the 10, 11 



mines. {See Mines.) 

 Water, influence of the narrowness of the vein on the 



path of rising 283 



mine, analysis of 152 



of the mines, possible explanation of the head. of. 243 



possible origin in the Sierra 242 



source of, unexplained 241 



variations of temperature of the . . . 242 



sourceof hot 390 



supply of the Comstock 3 



the vehicle of heat 265 



Weathering of rock masses 371 



Werlau, experiments made by von Strombeck at 310 



West Gate, propylite from 142 



West wall, character of, King on 24 



Whitney, J. D., on the age of the metamorphic rocks of 



the District 13 



Wire, faults in 320, 327, 328, 363 



Woodward, R. W., analysis by table following page 151 



Workings, extent of the 284 



Wrinkle, L. F. J., mapping by 284 



Yellow Jacket, analysis of clay from the . . . table follow- 

 ing page iSl 



analysis of ore from the 153 



analysis of propylite horse from the 



table following page 151 



analysis of water from the , 152 



cross-section through the 276 



diabase in the .51,115,198 



eruptive diorite in the 192 



later diabase in the 199 



slates in the 191 



temperatures of the 231, 244, 250 



water of the 230 



TeWnv Jacket. Mhaft, equation between temperature and 



depth in the 262 



temperature observations in the 230, 



244,250,*260 

 Yield. (.S'eeProduct, Gold, Silver, Bonanzas, Richthofen, 

 Lord.) 



of ores, von Richthofeu on 18 



Zacat«cas, propylitic chai-acter of 13 



Zeolites, occurrence of, von Richthofen on 17 



Zero method 295, 296, 320, 353 



Zircon in earlier hoiiiblende- andesite 56 



in eruptive diorite 38,39,40 



in granite 34 



in metamoi-phic diorite 44 



in quartz- porph>Ty 45, 47 



in slides 92, 94, 96, 98, 104, 108, 109, 119, 142 



Zirkel, F., on dacite 13 



on diorite 12 



ou feldspar in later homblende-andesite 69 



on propylite 81 



on propylite and andesite 27 



on quartz-porphjTy 47, 111 



report on the Washoe rocka by 26 



Zonal structure of plagioclaae 37, 61, C7 



160^ 



