INDEX. 
501 
•     Page. 
Pegmatites,  geologic  occurrence  of 383-384, 
394-395, 403-404 
mica  in 400-418,423, 425 
origin  of 418-420 
sections  of,  figures  showing 413,416 
Pendleton,  Ind.,  glass  sand  near 365 
Pennsylvania,  clays  in.  paper  on 322-334 
clays  and  shales  in,  work  on :  335-354 
iron  ores  of,  work  on 22 
magnetite  in,  work  on 185-189 
mineral  paint  ores  of.    See  Lehigh  Gap, 
Pa. 
phosphorus  ore  in.    See  Mount  Holly 
Springs,  Pa. 
Vnsacola,  Fla.,  glass  sand  at 378 
glass  sand  at,  analysis  of 382 
'eppel,  S.  V.,  cited  on  cost  of  making  sand- 
lime  brick 257 
'eridotite,  analysis  of 126 
>eru  Township,  Iowa,  limestone  and  shale 
from,  analyses  of 228 
'erry,  Ga.,  clay  beds  near 312-313 
Phalen,  W.  C,  and  Martin,  Lawrence,  paper 
by,  on  clays  and  shales  in  Cam- 
bria County,  Pa 344-354 
Philadelphia    Clay    Company,    clay    beds 
worked  by 322, 324, 327 
operations  of 327-330 
Philipsburg    quadrangle,     Mont.,     general 
geology  of 33-35 
ore  in,  distribution  and  character  of 35  : 
ore  production  of 33  j 
report  on  ore  deposits  in 31-55  | 
Phillips,  A.  J.,  analyses  by 234, 
235,237,238,241,242,243 
Phillips,  W.  B.,  analyses  by 176,249 
cited  on  silica  in  Knox  dolomite 253-254 
Phlogopite,  importation  of 400 
Phosphates  and  phosphorus,  papers  on. . .  449-482 
Survey  publications  on,  list  of 483 
Phosphate-bearing  rocks,  description  of. .  452-453 
Phosphate  deposits  (developed),  northern 
Arkansas,  paper  on 463-473 
Pennsylvania,  paper  on 474-483 
western  United  States,  paper  on 449-462 
work  on 25 
Phosphorite,    extraction     of      phosphorus 
from 47 
Phosphorus,  manufacture  of 474,  478-481 
production  of 481-482 
uses  of 482-483 
Pierre  shale,  analyses  of 238, 243 
occurrence  of 237-238, 243 
Pigeon  Hill  quarry,  granite  of,  composition 
of 358 
Pine  Bar  gold  diggings,  Snake  River,  Wyo., 
operations  at 78-79 
Pine  Grove  Furnace,  Pa.,  brick  clays  used 
at 324,325 
clay  beds  at 332 
Piney,  Pa.,  clay  near 341, 342 
Piney  Mountain,  Oreg.,  nickel  deposits  at.  120-127 
Pinkney,  Term.,  iron  ores  from,  analyses  of.      154 
Piollett,  Pa.,  clay  near 342 
Pipe  clay,  analyses  of 272 
tests  of • 275 
Page. 
Pismo  formation,  diatomaceous  earth  in .  439,  445 
Plasters,  materials  for,  work  on 24 
Survey  publications  on 266 
Platinum,    occurrence   of,   in    Snake    River 
gravels 87  88 
Survey  publications  on,  list  of 129 
Platteville  formation,  analyses  of  rocks  in.  228, 229 
sections  of 227-229 
Plumtree,  N.  C,  mica  near 407, 409 
Poland,  Me.,  feldspar  at 392 
Polk  Bayou  limestone,  description  of 466, 473 
Porter,  J.  T.,  paper  by,  on  properties  and 
tests  of  fuller's  earth 268-290 
work  of 24 
Portland,  Oreg.,  electric  smelting  at 212 
Portland  cement,  cost  of  making 244 
demand  for 232 
plant  for  making,  cost  of 244 
plants  for  making,  location  of,  in  West- 
ern States,  map  showing 240 
Survey  publications  on,  list  of 245-246 
work  on : 225-244 
Potomac  formation,  Ga.,  clays  of 304-306 
Potosi  Station,  Wis.,  section  of  Platteville- 
Galena  beds  near 229 
Potsdam  sandstone,  use  of,  in  glass  making       378 
Potter,  Clark,  farm  of,  clay  on 341 
Pottsville  formation,  cla;  s  in 337, 
339, 345. 348-  349. 3.50-351 
section  of 336 
use  of,  for  glass  sand 367 
Powdermill  Creek,  N.  C,  mica  near 409 
Preuss   Range,   Idaho,  phosphates  in   and 
near 450 
structure  in 454 
Prince  Metallic  Paint  Company,  works  of . .       436 
Prince's    Manufacturing    Company,    painl 
works  of 436 
Prouty,  W.  F.,  work  of 247 
Publications  of  the  Survey,  form  and  char- 
acter of 8-13 
Purdue,  A.  H.,  paper  by,  on  developed  phos- 
phate deposits  in  northern  Ar- 
kansas     463-473 
work  of 25 
Puzzolan  cement.    See  Cements. 
Pyrite  and  sulphur,  papers  on 483-489 
Survey  publications  on 490 
Q. 
Quartz,  deposits  of,  work  on 24 
manufacture  of 388 
occurrence  of 406 
uses  of 387-397 
See  also  Maine,  pegmatites  of;  quartz  of. 
Quartz  and  feldspar,  papers  on 383-399 
See  also  Pegmatites. 
Quicksilver,  Survey  publications  on,  list  of  .      129 
Quincy  granites,  shades  of,  cause  of 358 
R. 
Ransome,  F.  L.,  cited  on  Silverton  quad- 
rangle, Colorado 26 
work  of 16, 17-18 
Ransome,    F.    L.,   and   Hillebrand,    F.    L., 
quoted  oncarnotite  of  Colorado       111 
