B. Silliman on the Mining Districts of Arizona. 305 
south of the Skinner and of generally similar character, but, at 
the time I saw them, almost completely unexplored. 
Some of the smaller lodes of this district appear to me to offer 
the hope of a much less costly exploration, and with the promise 
of quicker returns. Of this class I may mention the Caledonia 
and Dayton, a few hundred feet south of the Moss lode, and the 
Quackenbush. and Knickerbocker, some distance south of the 
Skinner and Parsons. ‘These veins are from three to ten feet in 
thickness, well defined, and showing at surface all the characters 
ins. Besides well characterized — 
by t 
yielded when 
lars <a two hundred and fifty dollars per ton of two thousand 
pounds, 
n 
many remarkable outcroppings of quartz veins carrying the 
In the vicinity of Austin, (Reese River) Nevada, the veins are 
More numerous, probably, but are also much smaller and quite 
Conspicuous, having, in fact, almost uniformly no outcrops to 
attract the attention of the explorer. : 
Both districts are situated in a desert and inhospitable region, 
but the fervid heats of the Arizona summer are fully counter- 
balanced by the severe cold and snows of the more northern 
Colorado, and in a regi 
Civilization, Passin 
ik peaks on either side of the pass are, however, much higher, but I had no 
°pportunity to measure them by the barometer. 
Am. Jour. Sc1.—Seconp Series, Vou, XLI, No. 123.—Mar, 1866. 
39 
