"ARMANI PENNSYLVANIA PETROLEUM. 178 
Peridot, occurrence and statistics of MR 1901, pp 74U-747, 770 
Peridotite, analysis of, from British Columbia, Eagle Creek Bull 193, p 44 
analysis of, from Russia, Mount Solo vie v Bull 193, p 75 
Perkiomen Creek, Pennsylvania, flow of, measurement of Ann 22, 
iv, P p 121-123; WS 47, pp 98-99; WS 65, p 217; WS 75, p 29 
rainfall, run-off, and evaporation in basin of WS 80, pp 94, 99 
Permeability of rocks WS 67, pp 15-16 
Permian ammonoids of America Mon xlii, p 16 
Permian rocks of Kansas, fossil plants of Upper Carboniferous, and Bull 211, 
pp 83-115 
Permian vertebrates of Kansas Bull 211, p 72 
Permo-Carboniferous series of bituminous coal field of Pennsylvania, Ohio, 
and West Virginia '... .Bull 65, pp 20-42 
Persia, petroleum in, occurrence of MR 1900, p 627 
Peru, borax production of MR 1901, p 872 
copper from, statistics of MR 1900, pp 1S4, 185; MR 1901, p 194 
petroleum in, statistics of MR 1900, pp 590-591 ; MR 1901, pp 586, 611 
Peshastih district, Washington, gold mining in Bull 213, pp 78-79 
Peteetnete Creek, Utah, irrigation data relating to WS 52, pp 507-508 
Peters (W. J.), work in charge of Ann 22, i, pp 97-98, 167-168; Ann 23, pp 77-80 
Petersburg coal of Indiana . . . GF 84, p 7 
Petersburg formation of Indiana GF 84, p 2 
Petrified forest of Arizona MR 1901, pp 756-758 
Petrographic characters of granite, gabbro, greenstone, slates, conglomerate, 
etc., in Minnesota, Vermilion district Mon xlv, passim 
Petrographic relations of iron ores to adjacent rocks in Minnesota, Mesabi dis- 
trict Mon xliii, pp 233-234 
Petrography, bibliography of, 1892-1900, 1901 Bull 188; Bull 203 
index to, 1892-1900, i901 Bull 189; Bull 203 
of Crater Lake National Park PP 3, pp 63-164 
Petrography, microscopic, of the Elkhorn mining district, Montana Ann 22, 
ii, pp 511-549 
Petroleum ; accumulation of, factors controlling Bull 212, 
pp 140-145; Bull 213, pp 336-338, 347-348 
analysis of, from Colorado, Boulder MR 1901, p 560 
from Ohio, Lima . MR 1901, p 572 
from Pennsylvania MR 1901, p 572 
from Russia MR 1901, p 572 
from Texas, Beaumont MR 1901, p 572 
Corsicana MR 1901, p 582 
association of sulphur, gypsum, rock salt, and Bull 184, pp 49-53 
character, origin, mode of accumulation, etc., of Bull 198, pp 12-16 
composition of, ultimate, from various sources Bull 212, p 149 
in Alaska, Copper River region Copper, p 92 
in California Bull 213, pp 306-321 
in Coal Measure rocks, origin of Bull 184, p 12 
in Colorado, near Boulder Bull 213, pp 322-332 
in Ohio, eastern, structural work in the field in 1901 and 1902 Bull 213, 
pp 336-344 
in Pennsylvania, Masontown and Uniontown quadrangles GF 82, pp 19-20 
in Pennsylvania, northern Ann 22, in, pp 573-627 
in Texas, Austin quadrangle GF 76, p 7 
Beaumont; comparative fuel value of coal and Bull 212, pp 160-161 
in Texas-Louisiana Gulf Coastal Plain Bull 212; Bull 213, pp 345-352 
