414 



GENERAL INDEX. 



O. & O. (D. 3), assay of diabase from the 155 



cross-section through the -. . . 269 



dioriteinthe 197 



Calcite, occurrence as gangae 219 



Calcium and magnesium salts, relative solubility of 212 



Caledonia, assay of granular diorite from the 154 



assay of quartz-porphyry from the 155 



later diabaso in the 199 



metamorphics in the 191 



quartz-porphyry of the 47 



remarkable flood in the 232 



Calibration of thermoelement 298 



Oa(t/omia, analysis of ore from the 153 



V. Richthofen on the prospects of the 23 



California -diid Consolidated Fir^nia bonanza 270 



ore of the 219 



sagar quartz of 



the 221 



Carbonic acid as a solvent 226 



part played by, on the Lode 386 



Carpathian Mountains, propylite of 81 



Cedar Hill (D. 2), analysis of diorite from table fol- 

 lowing page 151 



dioritesof 40,42,97,150,195 



lithological character of 15 



ore deposits of 16 



quartz veins of 218, 219, 220, 225 



Cedar Hill Canon (D. 2), andesites of 55,56 



earlier hornblende-andesite from. 34, 122, 201 



Cedar Hill veins part of the Comstock 220 



Central, von Richthofeo on the prospects of the 23 



Chemistry of the Lode 209, 384 



Chimneys produced by faulting 179 



Chlorine, part, played by, on the Lode 20, 386 



Chlorite. {See illustrations.) 



alteration of, to epidote 213 



alteration of the quartz and carbonates 213 



characteristics of 369 



decompositi on of 77, 384 



formation of, from ferro-magnesian silicates . . 74, 

 210. 384 



solubility and diffusion of 40 



O hollar, analysis of clay from the table following 



page 151 



assay of diabase from the 155 



diabase of the 116 



diorite of the 96 



eastern fissures in the 276 



later diabase from the 151 



Church, J. A., denies that the Comstock is a vein 30 



diagrams of the Consolidated Virginia and 



California hona-QZSL 270 



memoir on the Comstock Lode 28, 29 



ou diorite 184 



on faulting 156 



on loss of heat in the mines 239 



on sugar quartz 30 



on the heat of the Comstock 31, 230, 290 



on the Jxcstice ore body 30 



on the lithology of Washoe 28 



on ventilation of the mines 3 



Circuit, breaks in, how detected 329 



resistances of 330, 334,338 



Claim-map, preparation of 284 



Claj's, analyses of table following page 151 



character of the 273 



Clays, not essentially kaolin 217 



of the Comstock 394 



of the Lode, von Kichthofen on 17 



Clifford mine, Wales, temperature of the 228 



Coldberry lead mine, electrical activity of the 311 



Collections, enumeration of the 207 



extent of the 369 



Covfihination shaft {D. 4), assay of earlier hornblende- 

 andesite from near the 155 



earlier hornblende-andesite near the 56, 

 117, 151 

 temperature observations in 



the 231, 244, 246, 2G0 



Commutator 328,354 



Comstock ffssure due to trachyte eruption, von Richt- 

 hofen on 18 



Comstock Lode. (SeeYem.) 



iof. 



184 



bullion product of the 10 



character of the, below the great 



horse 267 



Church's memoir on the 28 



complex structure of the 269 



conclusions regarding the history of 



the 285 



conclusions regarding the, von Richt- 



hofen's 23 



condition of the, during examination . . 266 



contents of the 393 



contents of the, von Richthofen on 16 



continuity in depth, von Richthofen .. 21 

 cross-section of the, throughtheC (feO. 269 

 cross-section of the, von Richthofen on . 14 



detailed description of the 266 



dip of the. in Gold Hill 277,283 



dynamical action in the, von Richt- 

 hofen on 16 



electrical activity of the 317, 321, 322 



faulting on the, von Richthofen on . . . 15 



character of the 392 



, outline of the 266 



geographicalpositionof the 2 



history and statistics of the 368 



history of the, Church on the 29 



King's memoir on the 24 



King's summary of the geology of the. . 25 

 mean width of, von Richthofen on . . . 21 

 mode of occurrence, von Richthofen on 14 

 narrowness of the, on the Sutro Tunnel 



level 283 



not a vein, according to Church 30 



probabilities for its future 287, 396 



probable character in depth, von Richt- 

 hofen on 22 



report on, by von Richthofen 12 



summary of the geology of the 368 



walls of the 207 



Comstock mines. {Sec Mines.) 



Conclusions, von Richthofen's, regarding the Lode 23 



Conduction curve, the Sutro I^tnncUemperaturesforma. 263 



Consolidated Virginia, cross-section through the 269 



Consolidated Virginia and Calif omia, bonanza 270 



electrical activity 



in the 317,322 



Contact, electrical, with vein.. 318,324 



permanent 317 



