640  INDEX    TO    PUBLICATIONS    OF    U.    S.    GEOL.    SURA^EY.      Lbull.177. 
Pyrite,  analysis  of  residue  from MR  1885,  p  514 
composition  of Bull  150,  p  30 
foreign  deposits  of MR  1883-84,  pp  881-886; 
MR  1885,  pp  506-508;  MR  1886,  pp  654-656 
formation  of,  in  Comstock  lode Mon  in,  p  210 
in  Montana,  Butte  district GF  38,  p  6 
in  Porto  Rico Ann  20,  vi  cont,  p  778 
occurrence  of  (precious  stone) MR  1882,  p  498;  MR  1883-84,  pp  768-769,  781; 
MR  1885,  p  443;  MR  1886,  p  604;  MR  1887,  pp  556-557; 
MR  1888,  pp 584-585;  MR  1889-90,  pp446,  447, 448;  MR  1891, 
p  540;  MR  1892,  p  781;  MR  1893,  pp  681-682;  Ann  16,  iv, 
pp  604-605;  Ann  17,  in  cont,  p  924;  Ann  18,  v  cont,  p 
1217;    Ann    19,  vi   cont,  p   513;    Ann   20,  vi  cont,  p  599 
solubility  of Mon  xin,  pp  432-433,  174 
statistics  of  (iron  pyrite) MR  1883-84,  pp  877-905;  MR  1885,  pp  501-517; 
MR  1886,  pp  650-675;  MR  1887,  pp  95,  556,  609-610;  MR 
1888,  pp  5,584;  MR  1889-90,  p  518;  MR  1891,  pp  570-571; 
MR  1892,  p  791;  MR  1893,  pp  742-745;  Ann  16,  iv,  pp  644- 
645;  Ann  17,  in  cont,  pp  973,  977;  Ann  18,  \  cont,  pp  1259- 
1261 ;  Ann  19,  vi  cont,  pp  572-576  Ann  20,  vi  cont,  pp  652-655 
thin  section  of,   from  California,   Grass  Valley,  showing  gold  in  quartz 
and Ann  17,  n,  pp  134-135 
from  Colorado,  Telluride  quadrangle,  Cimarron  mine,  iron,  of  doubt- 
ful genesis Ann  18,  in,  pp  850-851 
Telluride  quadrangle,  Gold  King  mine,  showing  partial  replace- 
ment of  a  ferromagnesian  silicate  by Ann  18,  in,  pp  850-851 
Pyrites  and  sulphur,  relative  merits  in  the  manufacture  of  sulphuric  acid.. MR  1893, 
pp  743-745 
Pyritiferous  porphyry  of  Colorado,  Leadville Ann  2,  p  344;  Mon  xn,  pp  82-83 
of  Colorado,  Leadville  district,  petrography  of Mon  xn,  pp  326-327 
Pyrochlore,  analysis  of,  from  Massachusetts,  Chesterfield Bull  126,  p  111 
Pyroclastics  of  Michigan,  Crystal  Falls  district Ann  19,  in, 
pp  52,  55-60;  Mon  xxxvi,  pp  94, 135-148 
Pyrocrystalline  rocks Bull  86,  p  440 
Pyroelectric  qualities  of  alloys  of  platinum Bull  54,  pp  126-164 
Pyrolusite,  analysis  of,  from  East  Indies,  Gosalpur Ann  17,  in,  p  221 
analyses  of,  from  Georgia,  Etowah. MR  1883-84,  p  552 
from  Virginia,  Crimora  station MR  1883-84,  p  551 
Pyrometric  use  of  viscosity Bull  54,  pp  239-306 
Py rometry ,  investigations  in Ann  14,  i,  pp  150-153 
methods  of,  general  account  of Bull  54,  pp  23-55 
Pyrope,  analysis  of,  from  Kentucky,  Elliott  County  (from  peridotite) Bull  38, 
pp  24-25;  Bull  42,  p  136 
chemical  constitution  of Bull  125,  p  21 
thin  section  of,  from  Kentucky,  Elliott  County  (from  peridotite) Bull  38,  p  16 
Pyrophosphate,  analysis  of  silver Bull  167,  p  116 
analysis  of  sodium Bull  167,  p  116 
Pyrophyllite,  analysis  of,  from  North  Carolina,  Carbonton  (schistose) . .  .Bull  74,  p  62 
analysis  Of,  from  North  Carolina,  Deep  River  (schistose) Bull  74, 
p62;  Bull  167,  p  16 
from  Vermont,  Ira Ann  19,  in,  p  191 
chemical  constitution  of Bull  125,  pp  95, 106 
experiments  relative  to  constitution  of Bull  167,  pp  16-1 7 
Pyroplastic  rocks,  one  of  E.  Emmons's  divisions Bull  S6,  p  440 
