636  INDEX    TO    PUBLICATIONS    OF    U.    S.    GEOL.    SURVEY,      [bull.  177. 
Precious  stones;  statistics  of MR  1882,  pp  482-503;  MR  1883-84,  pp  723-782;  MR 
1885,  pp  437-444;  MR  1886,  pp  595-605;  MR  1887,  pp  555- 
579;  MR  1888,  pp  580-585;  MR  1889-90,  pp  445-448;  MR 
1891,  pp  539-551;  MR  1892,  pp  756-781;  MR  1893,  pp  680- 
702;  Ann  16,  iv,  pp  595-605;  Ann  17,  in  cont,  pp  895-926; 
Ann  18,  v  cont,  pp  1183-1217;  Ann  19,  vi  cont,  pp  497-514; 
Ann  20,  vr  cont,  pp  557-602;  Ann  21,  vi  cont,  pp  419-462 
Precipitation.     (See  Rainfall.) 
Predentata  of  North  America Ann  16,  i,  pp  186-202,  206-225 
Prehnite,  analysis  of,  from  Tyrol,  Fassa Bull  113,  p  112 
chemical  constitution  of Bull  125,  pp  16,  20-21,  45,  102 
composition  of Bull  150,  p  40 
occurrence  and  statistics  of MR  1 882, 
p  493;  MR  1893,  p  682;  Ann  16,  iv,  p  605;  Ann  17,  m  cont, 
p   924;  Ann   18,   v  cont,   p  1217;  Ann  19,  vi  cont,  p  513 
Preston  (R.  E.) ,  gold  and  silver,  statistics  of MR  1893,  pp  50-61 
Preston  beds  of  Texas Ann  21,  vn,  pp  252-258 
Presumpscot  River,  Maine,  flow  of,  measurements  of Ann  20,  iv,  p  46 
water  power  of Ann  19,  iv,  pp  97-99 
Pressure,  behavior  of  solids  under  high Bull  55,  pp  67-75 
contractions  due  to  cooling  under Bull  92,  pp  56-61 
effect  of,  on  electrical  conductivity  of  mercury Bull  92,  pp  68-77 
experiments  showing  relation  of  fusion  and  ebullition  to Bull  103 
influence  of,  on  crystallization  of  igneous  magmas Bull  66,  p  25 
investigations  in  relation  to  high Ann  14,  i,  pp  153-154 
method  of  obtaining  and  of  measuring  very  high Bull  96,  pp  17-32 
relation  of,  to  schistose  structure Bull  59,  p  43 
Pressure  and  igneous  fusion,  relation  of,  investigation  of Ann  14,  i,  pp  157-158 
Pressure  and  temperature,  dependence  of  fluid  volume  on Bull  92,  pp  17-67 
Pressure,  density,  and  gravity,  terrestrial,  table  of  variation  of Ann  13,  n,  p  236 
Pressure  (high-)  chemistry,  investigations  in Ann  14,  i,  pp  160-162 
Pribilof  Islands,  Alaska,  notes  on Alaska  (2),  p  121 
Price  formation  of  Virginia  and  West  Virginia GF  28,  p  3;  GF  44,  p  3 
Priceite,  analyses  of,  from  Oregon,  Curry  County. .  .Bull  55,  p  58;  MR  1889-90,  p  505 
Priest  River  Forest  Reserve,  forest  conditions,  timber,  fires,  etc.,  of Ann  19, 
v,  pp  59-61,  217-252 
Primal  series,  origin  of  name Bull  81,  p  251 
Primary  rocks.     (See  Archean.) 
Primeval  rocks,  possible  character  of Mon  xiii,  pp  171-174 
Primitive  rocks,  history  of  term Bull  86,  p  470 
Primordial,  origin  of  term Bull  81,  p  243 
Prince  Edward  Island,  presence  or  absence  of  Newark  rocks  on Bull  85,  pp  25-31 
Prince  William  Sound,  Alaska,  topography  of  and  drainage  into Ann  20, 
vii,  pp  378-384 
Prince  William  Sound  and  Copper  River  region,  Alaska,  reconnaissance  in,  in 
1898 Ann  20,  vn,  pp  341-423 
report  on Alaska  (2),  pp  51-63, 105-108 
Princeton  conglomerate  in  Virginia  and  West  Virginia Ann  17, 
ii,  pp  489-490;  GF  26,  p  3;  GF  44,  p  3 
Principles  of  North  American  pre-Cambrian  geology Ann  16,  i,  pp  571-843 
Principles  and  definitions  in  geologic  science Ann  11,  i,  pp  238-303 
Principles  and  methods  of  rock  analysis Bull  176 
Procamelus  beds  of  Montana Bull  84,  p  333 
Prochlorite,  analysis  of,  from  District  of  Columbia .Bull  9,  p  13;  Bull  78,  p  19 
analysis  of,  from  North  Carolina,  Culsagee Bull  74,  p  67 
chemical  constitution  of Bull  125,  pp  54,  104 
