748  INDEX    TO    PUBLICATIONS    OF    U.    S.    GEOL.    SURVEY,      [bull.  177. 
Sphalerite  in  Montana,  Butte  district GF  38,  p  6 
Sphene,  analysis  of,  from  District  of  Columbia Bull  27,  p  262 
chemical  constitution  of Bull  125,  pp  79, 105 
crystal  of,  around  ilmenite,  thin  section  of,  from  Michigan,  above  Upper 
Quinnesec  Falls  (from  dioritic  rock) Bull  62,  pp  232-233 
(See,  also,  Titanite.) 
Sphenoclase,  chemical  constitution  of Bull  125,  pp  84, 106 
Sphenophyllales  from  Lower  Goal  Measures  of  Missouri Mon  xxxvu,  pp  173-187 
Sphenopteridese  from  Carboniferous  of  Missouri Mon  xxxvn 
pp  35-74;  Bull  98,  pp  43-60 
Spheroidal  parting  in  greenstones Bull  62,  pp  166-168,  177 
Spheroidal  weathering  in  igneous  rocks,  description  and  illustration  of Bull  150, 
pp  385-387 
in  shale  from  Dry  Creek,  California,  description  of,  as  one  of  educational 
series Bull  150,  p  387 
Spherulite,  thin  section  of,  from  Pennsylvania,  South  Mountain  (in  aporhyo- 
lite) Bull  136,  pp  110,  111,  112,  113;  Bull  150,  pp  346-347 
thin  section  of,  from  Yellowstone  Park Ann  7,  pp  272-273, 
276-277;  Mon  xxxn,  n,  pp  414-415;  Bull  150,  pp  156-157 
Spherulites,  analyses  of,  from  Colorado,  various  localities Bull  90, 
p  69;  Bull  148,  p  170;  Bull  168,  p  152 
analyses  of,  from  Yellowstone  Park,  Obsidian  Cliff Ann  7,  pp  282,  291 
description  and  figures  of Bull  150,  pp  153-160 
of  Yellowstone  Park Ann  7,  pp  262-264,  276-278;  Mon  xxxn,  n,  pp  410-416 
relation  of  granophy re  groups  to Ann  7,  pp  274-276 
Spherulitic  structure,  thin  section  of,  from  Yellowstone  Park Mon  xxxn, 
ii,  pp  422-423 
Sphinx  conglomerate  of  Montana GF  24,  p  3 
Spiegel,  imported,  analyses  of MR  1883-84,  p  561,  562 
Spiegeleisen,  production  of MR  1891,  p  56;  Ann  21,  vi,  p  93 
Spilosite,  analysis  of,  from  Germany,  Harz  Mountains Mon  xxxvi,  p  207 
analysis  of,  from  Michigan.  .Mon  xxxvi,  pp207,  210;  Bull  148,  p  97;  Bull  168,  p  69 
thin  sections  of,  from  Michigan,  Crystal  Falls  district Mon  xxxvi, 
pp  302-303,  304-305,  306-307 
Spinel,  analyses  of,  from  North  Carolina,  Madison  County Bull  74,  p  33 
chemical  constitution  of r Bull  125,  pp  47-48,  56 
composition  of Bull  150,  p  31 
occurrence  of MR  1882,  p  486;  MR  1883-84,  p  737;  MR  1892,  pp  762-763 
Spirit  leveling  in  Indian  Territory,  triangulation  and Bull  175 
in  the  various  States,  results  of,  1896-1900 Ann  18,  i,  pp  225-422;  Ann 
19,i,pp  191-408;  Ann  20,  i,  pp  292-530;  Ann  21,  i,  pp  376-582 
Spodumene,  analysis  of,  from  Massachusetts,  Norwich... Bull  126,  pp  156,  157 
analysis  of,  from  North  Carolina,  Alexander  County ." Bull  74,  p  44 
chemical  constitution  of Bull  125,  pp  87,  88,  104 
occurrence  and  statistics  of MR  1882,  pp  488-489;  MR  1889-90,  p  448;  MR 
1891,  p  540;  MR  1892,  p  781;  MR  1893,  p  682;  Ann  16,  iv,  p  605 
Spokane  quadrangle,  Washington,  forest  conditions  in Ann  21,  v,  pp  582 
Spokane  River,  Washington,  description  of WS  4,  pp  27-28 
flow  of,  measurements  of Ann  18,  iv,  pp  359-360;  Ann  19,  iv,  pp  487-489; 
Ann  20,  iv,  pp  63,  511;  Ann  21,  iv,  pp  424-426;  WS  11,  pp  85-88; 
WS  16,  p  177;  WS  28,  pp  166,  169,  170;  WS  38,  pp  370-371 
Spokane  shale  of  Montana,  description  and  section  of Ann  20,  in,  pp  282-283 
Spondylidse  from  Colorado  formation Bull  106,  pp  69-70 
from  Cretaceous  of  Pacific  coast Bull  133,  p  35 
from  lower  marl  beds  of  New  Jersey  .". Mon  ix,  pp  57-64 
