wakman]  PLEUROTOMARIID^E PORPHYRITE.  627 
Pol ylithionite,  analysis  of Bull  113,  p  23 
chemical  constitution  of Bull  125,  p  48 
Polymignite,  chemical  constitution  of Bull  125,  p  80 
Polyphosphonitrilic  chloride,  analysis  of Bull  167,  p  134 
Polypodiacese  from  Dakota  group Mon  xvn,  pp  24-25 
Polyzoa  from  Paleozoic  strata  of  Nevada,  Eureka  district  ..Mon  xx,  pp  322,  326,  331 
Pomperaug  Valley,  Connecticut,  Newark  system  in Ann  21,  in,  pp  7-162 
Ponderosa  marls  of  Texas Bull  82,  pp  116,  118,  123,  124,  127,  130,  221,  223 
Pondville  group  of  Narragansett  Basin Mon  xxxin,  pp  135-141 
Porcelain  clay.     (Sec  (May,  porcelain.) 
Porcupine  beds  of  Alaska,  correlation,  etc.,  of Ann  IS.  in.  pp  197-199 
Porcupine  gold  district  of  Alaska,  placer  deposits  of Ann  21,  n,  pp  374-376 
Porcupine  porphyry  of  Michigan Mon  v,  pp  209-212 
Porcupine  River,    Alaska,  notes  on Uaska  (2),  pp  88 
Pore  space  in  soil  and  rock,  determinations  of Ann  19,  n,  pp  208-218 
Porifera  from  Nevada,  Eureka  district Mon  vin, 
pp  Ll-12,  99-106;  Mon  w,  pp  320,  325,  330 
from  Yellowstone  Park Mon  xwn,  n.  p  508 
Porphyrite,  analysis  of,  from  California,  Banner  Hill Ann  17,  n,  p  59 
analysis  of,  from  California,  (  alaveras  County Ann  14, 
ii,  1 1  473;  Bull  148,  p  216;  Bull  168,  p  203 
from  California,  Eldorado  County Ann  14, 
ii,  p  47:',;  Ann  17,  i,  p  731;  Bull  148,  p  213;  Bull  168,  p  199 
various  localities Ann  14,  n,  p  473 
from  Colorado,  Leadville  district Mon  mi.  pp  340,589; 
Bull  148,  p  173;  Bull  168,  p  155 
West   Elk  Mountains,  Storm  Ridge Ann  L4,n,p227; 
Bull  148,  p  178;  Bull  168,  p  160 
from  Montana,  Crazy  Mountains..  Bull  L48,pp  L42,  14:5;  Bull  168,  pp  120, 121 
near  East  Gallatin  River  (highly  altered) Bull  60,  p  152; 
Bull  148,  p  138;  Bull  168,  p  112 
in  ( Jalifornia,  Colfax  quadrangle GF  66,  p  3 
Jackson  quadrangle GF  11,  pp  3-4 
Lassen  Peak  quadrangle GF  15,  p  1 
Marysville  quadrangle GF  17,  p  1 
Nevada  City,  Grass  Valley,  and  Banner  Hill  districts GF  29,  pp  2-3 
Placerville  quadrangle GF  3,  p  3 
femartsville  quadrangle GF  18,  p  3 
Sonora  quadrangle GF  41,  p  4 
in  Colorad*  >,  A  nthxacite  quadrangle GF  9,  p  4 
Crested  Butte  quadrangle GF  9,  p  5 
Mosquito  Range Ann  2,  p  224;  Mon  xn,  pp  85,  334-344 
in  Montana,  Livingston  quadrangle GF  1,  p  3 
Three  Forks  quadrangle GF  24,  p  4 
in  Sierra  Nevada Ann  14,  n,  pp  471-473 
in  Utah,  Henry  Mountains Ann  14,  n,  pp  175-177;  Mon  xn,  pp  359-363 
in  Wyoming,  Electric  Peak Ann  12,  i  pp  588-595 
thin  section  of,  from  Colorado,  Leadville  district Mon  xn,  pp  336-337 
Porphyrite  and  porphyry,  use  of  the  terms Ann  12,  i,  p  582 
Porphyrite  and  diabase  group  of  Nevada  City  and   Grass    Valley  districts, 
California Ann  17,  n,  pp  56-75 
Porphy rite-breccia  of  California,  Grass  Valley  district Ann  17,  n,  p  78 
Porphyrite-diorite,  analysis  of,  from  Colorado,  West  Elk  Mountains,  Mount 
Marcellina Bull  148,  p  178;  Bull  168,  p  160 
