620  INDEX    TO    PUBLICATIONS    OF    U.   S.    GEOL.    SURVEY,      [bull.  177. 
Plants,  fossil;  paleobotany,  sketch  of Ann  5,  pp  357-452 
paleobotany  and  botany,  interdependence  of Ann  5,  pp  366-367 
Potomac  formation,  lignite  and  fossil  wood  of Bull  56 
Potomac  or  younger  Mesozoic  flora,  monograph  on Mon  x  v 
Pottsville  formation  in  southern  anthracite  coal  field,  Pennsylvania,  strati- 
graphic  succession  of  fossil  flora  of Ann  20,  n,  pp  749-930 
species  of,  from  each  geologic  formation,  table  of  number  of  .  .Ann  5,  pp  440-441 
structure  of,  internal,  value  of  study  of Bull  56,  pp  11-38 
travertine  and  siliceous  sinter,  formation  of,  by  vegetation  of  hot  springs 
Ann  9,  pp  613-676 
types  of,  synoptic  view  of Ann  5,  pp  432-433 
wood,  fossil,  from  Virginia,  Richmond  Basin Ann  19,  n,  pp  516-519 
Plaster,  analysis  of,  from  Michigan  (land) MR  1887,  p  600 
analysis  of,  from  Ohio  (calcined) MR  1887,  p  600 
Plastic  clay.     (See  Clay,  plastic. ) 
Platanacese  of  Cretaceous  of  Black  Hills Ann  19,  n,  p  706 
of  Dakota  group Mon  xvn,  pp  72-75 
of  North  America  (extinct) Mon  xxxv,  pp  102-110 
of  Laramie  group Bull  37,  pp  34-37 
of  Yellowstone  Park Mon  xxxu,  n,  pp  727-729 
Plateau  province  of  western  United  States Ann  2, 
pp  49-68;  Ann  6,  pp  113-124;  Mon  n,  pp  9-15,  217-218 
(See,  also,  Arizona;  Colorado;  New  Mexico;  Utah;  Wyoming.) 
Platiniferous  nickel  ore  from  Canada Bull  64,  pp  20-21 
Platiniridium,  analyses  of,  from  Brazil  and  Russia MR  1883-84,  p  581 
Platinum,  foreign  sources  of MR  1883-84,  pp  576-577;  MR  1885,  pp  367-368 
in  Alaska,  Yukon  district,  occurrence  of Ann  18,  in,  p  366 
in  Russia .' Ann  19,  vi,  pp  269-271 
occurrence  of Ann  19,  vi,  pp  266-268 
production  and  mineralogy  of MR  1882,  pp  442-443;  MR  1883-84,  pp 
576-580;  MR  1885,  pp  367-369;  MR  1886,  pp  222-223;  MR 
1887,  pp  142-143;  MR  1888,  pp  165-167;  MR  1889-90,  pp 
143-144;  Ann  16,  in,  pp  628-633;  Ann  17,  in,  pp  281-283; 
Ann  18,  v,  p  349;  Ann  19,  vi,  pp  265-271;  Ann  20,  vi,  p  293 
pyro-electric  qualities  of  alloys  of Bull  54,  pp  126-164 
Platinum   ore,    analysis   of,    from   Australia,    California,    Russia,    and   South 
America MR  1883-84,  p  577 
analysis  of,  from  Oregon MR  1885,  p  367 
from  various  countries Ann  16,  in,  p  633 
Platte  River,  course  and  character  of TF  2,  p  6 
drainage  areas  in  basin  of Bull  140,  pp  95, 103, 114 
hydrography  of  basin  of Ann  12,  n,  pp  238-240 
hydrography  of  and  irrigation  in  basin  of Ann  13,  in,  pp  73-91 
profile  of WS  44,  pp  74-76 
rainfall  and  run-off  in  basin  of Ann  20,  iv,  pp  256-266 
stream  measurements  in  basin  of Ann  13,  in,  pp 
83,  84,  85,93;  Ann  18,  iv,  pp  141-193;  Ann  19,  iv,  pp  300- 
337;  Ann  20,  iv,  pp  54,  55,  255-304;  Ann  21,  iv,  pp  192-219; 
Bull  131,  pp  28-32;  Bull  140,  pp  95-123;  WS  11,  pp  50- 
56;  WS  15,  pp  81-100;  WS  27,  pp  76-89;  WS  37,  pp  214-244 
Playa  lakes  and  playas,  especially  those  in  Lahontan  Basin Mon  xi,  pp  81-85 
Playa  mud,  analysis  of,  from  Nevada,  Carson  Desert Mon  xi,  p  83 
Pleistocene,  Quaternary,  and  Glacial,  remarks  on  use  of  the  names Mon  i, 
pp  22,  395-396 
