Determination. 



Do.. 



Mica-diorit« 



Porphyritic diorite 



Metamorphic diorite 



Earlier diabase 



Quartz-porpliyry {"qnartz-propylite") 



Quartz-porphyry ("dacite") 



flomblende-andesite ("propylite") 



Homblende-andesite 



ABgite-andesite ("bomWende-andesite") . 



Do 



Later homblende-andeaito ("trachyte" 



Do 



Do 



' ("propylite") 



"Propylite" horse 



Clay 



locality. 



Eldorado outcrop, Mount Davidson . 



-do. 



800' E. of Waller Defeat shaft, point 5,521 (D. 5) 



Center of Cedar^Hill Eidge (D. 2) 



.Amazon mine (D. 7) 



Main Sutro Tunnel, hanging wall of Lode 



Hill west of American Flat, Washoe 



Hills above American City, "Washoe 



Cross-spur, below graveyard, "Washoe 



First HUl north of Gold HiU Peak, "Washoe 



Eidge northeast of American Mat, "Washoe 



Silver Terrace, "Washoe 



Cross-Spnr quarry, "Washoe 



Mount Eose, "Washoe 



.do. 



Washoe (Tirginia City) .... 

 Yellow Jacket, 830-foot level. 



Teliow Jacket east clay 



CAoZIar west clay 



Sale (6 Norcross east clay . . . 

 ■Socaje second station 



[Geol. Comstock Lode, ToL in.] 



' Supposing all the iron present as ferrous oxide. 



Table i.-^che 



[From the publications of tho Exploration of tk 



Analyst. 



R. "W. "Woodward . 



...do 



Gideon E. Moore.. 



...do 



...do 



.do. 



"W.G. Mister 



C. Coiincler 



"W.G.Mixter 



W. Kormanu 



"W.G.Mixter 



...do 



R. "W. Woodward . 

 ...do 



.do . 



.do. 



S. "W.Johnson . 

 W. G. Mixter . . 



.do . 



S. "W. Johnson . 



36.% 



60.83 



Fortieth 



excepting those by Dr. G.E. Moore.] 



3 Supposin; 



• all the iron present as ferric 



18.36 



8.55 



18.20 



8.48 



15.87 

 7.41 



15.48 



7.23 



17 32 



8.09 



15.99 

 7.47 



14.86 



6.82 



17 9 



8,31 



17 54 



8.17 



11.61 

 5.41 



18.17 



8.46 

 18.20 



8.48 



16.00 

 7.45 



17 81 

 8.30 



17 54 



17! 



a34 



6.45 

 1.43 



6.30 



1.4U 



1.25 



0.28 



2.07 



0.83 

 0.18 



4.11 



Trace. 

 0.11 



0.02 



0.10 

 0.02 



0.12 



0.03 



1.71 

 3.50 



1.00 



6.44 



1.84 

 9.29 



2.66 



6.98 



2.00 



1.90 



0.54 



1.6 

 0.46 



5.65 



1.61 

 4.33 



1.23 



6.19 

 1.77 



5.51 



1.57 



4.45 

 1.27 



5.12 



1.4C 



5.15 



1.47 



5.87 

 1.67 



0.54 

 6.00 



MgO 



3.92 



l..')7 



3.83 

 1.53 



1.79 

 0.71 



3.60 



1.42 

 6.69 



2.64 



NajO 



0. CI 



0.24 



2.40 



0.96 



2.90 

 1.16 



2.07 



0.8,1 



2.07 



0.83 



2.06 



0.82 



2.03 

 0.81 



Trace 

 1.40 

 4.41 



3.52 



0.91 



3.58 



0.92 



3.20 

 0.83 



3.99 



1.03 



3.46 



O.H!l 



3.83 



0.99 

 3.22 



0.83 



2.0 



3.20 



0.82 



3.31 



0.85 



3.87 

 I.OO 



4.27 

 1.10 



4.44 

 1.1 1 



2.07 



0.53 



1.94 

 0.45 



K.;0 



2.38 



0.40 



2.41 



2.02 



0.34 



0.96 



3.6 



0.61 



1.41 



0.24 



3.52 



0.60 



3.02 



0.51 



1.39 



0.24 



2.65 



0.45 



2.26 



0.38 



2.22 

 0.37 



3.19 

 0.54 



2.19 



C O2 Other components. 



Trace 

 Trace. 



P2 Os . 



P2O5 

 PjOs 



Pyrito 1.69 



Pyritel.84i Pj Os 



0.34. 

 Pyrito 3.58; P2O5 



trace. 

 Pynte2.84i PjOs 



trace. 

 Pyrite9.18; P2O5 



trace. 



Ignition. 



3.62 



2.44 



2.47 



2.26 



2.1 



2.31 



4.35 



0.76 



2.80 



2.00 



0.88 



0.95 



0.53 



1.83 



8.09 H2O 

 4.19 

 2.80 



9.95 H2O 



99.39 

 98.85 

 100. 75 

 100. 61 

 100. 24 

 99.78 



100. 50 

 101.9 



100. 394 



101. 03 

 99. 95« 



100. 02 

 100. 03 

 99.96 

 99.54 

 100. 36 

 100. 02 

 99.07 



100. 24 



Specific 

 gravity. 



2.05 

 2.71 

 2. 9582 

 2. 7972 

 2. 63, 2. 67 



Oxygen ratio of— 



2.6 



2.4, 2. 5, 2. 5 



2. 5, 2. 4 



0.445' 

 0.467^ 

 0.436' 

 0.460^ 

 0.375 



-aese totals do not agree with the items, no doubt in consequence of misprints ; the o-3^«en.contents of each constitu^^^^^^^^^^ 



to the percentage of the oxide given, and the errors therefore probably occur in the statements of the carbonic .cid 01 J 



