warman]  PICKENS PLAGIOCLASE.  617 
Pinacea?  of  Triassic  of  Pennsylvania Ann  20,  n,  pp  249-254 
Pine,  yellow,  reproduction  and  growth  of Ann  L9,  v,  pp  91-95 
Pine  zones  in  Washington  Forest  Reserve Ann  19,  v,  pp  327-330 
(See,  also,  Forest  Reserves;  Forests.) 
Pinnidse  from  Colorado  formation P>ull  106,  pp  88-89 
from  Cretaceous  of  Pacific  coast Bull  133,  p  49 
from  lower  marl  beds  of  New  Jersey Mon  ix,  pp  81-82 
Pinto  diorite  of  Montana,  Little  Belt  Mountains Ann  20, 
in,  pp  373-375,  488-493;  GF  56,  p  3 
Pinyon  conglomerate  of  Wyoming GF  30,  p  5 ;  GF  52,  p  3 
Pinyon  Peak  conglomerate  in  Yellowstone  Park Mon  xxxn,  n,  pp  184-188 
Pipe  clay.     (See  Clay,  pipe. ) 
Pipes,  conveyance  of  water  in  irrigation  canals,  flumes,  and WS  43 
Pipes  and  hydrants  used  in  subirrigation Ann  13,  in,  pp  338-341 
Pipestone,  analysis  of,  from  Minnesota Ann  16,  iv,  p  488;  MR  1889-90,  p  404 
(See  Catlinite. ) 
Pirsson  (L.  V. ),  description  of  diabase,  as  one  of  rocks  of  educational  series.  .Bull  150, 
pp  264-273 
petrography  of  igneous  rocks  of  Little  Belt  Mountains,  Montana Ann  20, 
in,  pp  463-581 
Pirsson  (L.  V.)  and  Weed  (W.  H.),  geology  and  mineral  resources  of  Judith 
Mountains,  Montana Ann  18,  in,  pp  437-616 
geology  of  Castle  Mountain  mining  district,  Montana Bull  139 
Pisces  from  Devonian  beds  of  New  York Bull  16,  pp  17-20, 40-43 
from  Eocene  of  middle  Atlantic  slope Bull  141,  pp  60-63 
Pisidiidse,  nonmarine  fossil,  of  North  America Ann  3,  pp  440-441 
Pit  River,  California,  profile  of WS  44,  p  92 
Pitch  coal  of  Oregon,  Coos  Bay  coal  field Ann  19,  in,  pp  368-376 
Pitehstone,  analysis  of,  from  Colorado Ann  17, 
ii,  pp  320,  324,  454;  Bull  148,  p  168;  Bull  168,  p  150 
analysis  of,  from  Connecticut,  Meriden  (basic) . .  .Mon  xxix,  p  437;  Bull  168,  p  35 
from  Montana,  Butte Bull  168,  p  119 
from  Utah,  near  Marysvale Bull  168,  p  168 
of  Colorado,  Rosita  Hills Ann  17,  n,  pp  301,  319-320,  400-402 
Placer  deposits  of  Alaska Ann  18,  in,  pp  317-379;  Alaska  (I) ,  pp  28-35 
of  Colorado,  Cripple  Creek  district ..Ann  16.  n,  pp  150-151 
La  Plata  quadrangle GF  60,  p  14 
Telluride  district Ann  18,  in,  pp  830-831 ;  GF  57,  p  13 
of  Idaho Ann  16,  n,  pp  273-274 
western-central  Ann  20,  m,  pp  1]  3-163,  234-235,  240-244 
Placerville  quadrangle,  California,  geology  of GF  3 
Placodermi  from  Devonian  and  Carboniferous  rocks  of  North  America Mon  xvi, 
pp  33-37, 51-53, 108-112, 130-181 
Plagioclase,  analysis  of,  from  Minnesota,  Pigeon  Point Bull  109,  p  34 
analysis  of,  from  New  York,  near  Port  Kent Bull  107,  p  24 
from  olivine-diabase Bull  150,  p  276 
(It-termination  of,  methods  of Ann  is,  m,  pp  30-35 
thin  section  of,  from  Michigan,  Eagle  Harbor  (  sandstone) Ann  5,  p  238 
from  Minnesota,  Pigeon  Point  (from  porphyritic  rock)  ...Bull  109,  pp  62,63 
from  New  York,  Adirondacks,  showing  reaction  veins. .Ann  19,  in,  pp414-415 
Plagioclase,  diopside,  and  segirine-augite,  thin  section  of  aqueous  deposit  of, 
iV(  >n i  M assachusetts Mon  xxix,  pp  430-431 
Plagioclase-basalt,  analysis  of,  from  Colorado,  Pikes  Peak  district Bull  148, 
p  L63;  Bull  168,  p  145 
