390  INDEX    TO    PUBLICATIONS    OF    U.    S.    GEOL.    SURVEY,     [bull.  177. 
Igneous  rocks,  segregation  or  differentiation  in,  process  and  phenomena  of. . . Ann  18, 
in,  pp  301-312 
structural  features  of  Keweenaw  series Ann  3,  pp  116-131 ;  Mon  v,  pp  134—151 
definition  of Bull  17,  pp  14-15 
discussion  on Mon  xn,  pp  302-304,  319-321 
distinct  from  those  of  clastic  rocks Bull  62,  p  196 
importance  of  understanding Bull  62,  p  196 
lamination  of  acid  lavas,  cause  of Ann  7,  pp  260,  286 
lithophysse,  origin  of . Ann  7,  pp  279-290 
micropegmatite  (granophyre)  in  relation  to  spherulites Ann  7,  pp  274-276 
spherulites,  character  and  origin  of Ann  7,  pp  262-264,  276-278 
transitions  in Bull  17 
structures  of,  amygdaloidal Mon  v,  pp  134—139 
structures  of,  columnar,  in  basalt  of  volcanic  necks Ann  6,  pp  172-174 
in  obsidian Ann  7,  p  257 
structures  of,  granitoid  and  porphyritic Mon  xm,  pp  162-164 
structures  of,  poikilitic Bull  62,  pp  78,  79, 183, 196 
succession  of,  in  Coast  Ranges  of  California Mon  xm,  pp  221-225 
in  Keweenaw  series Mon  v,  pp  432-436 
in  Nevada,  Eureka  district Ann  3,  pp  273-276,  281-285 
Washoe  district Mon  in,  pp  188-208,  380-388 
means  of  determining Mon  m,  p  188 
synthesis  or  mixing  in,  processes  of Ann  18,  in,  pp  307-308 
Tertiary  and  Keweenawan  eruptives,  comparison  of Mon  v,  p  436 
work  of  Survey  on,  summary  of Ann  10,  i,  pp  45-49;  Ann  14,  i,  pp  87-98 
(See,  also,  Eruptive  rocks;  Lava;  Rocks;  Volcanic;  and  names  of  the  vari- 
ous kinds  of  igneous  rocks.) 
Iguanodon,  remarks  on,  and  restoration  of Ann  16,  i,  p  230 
Ihlseng  (M.  C. ),  phosphate  prospect  in  Pennsylvania Ann  17,  in  cont,  pp  955-957 
lies  (M.  W.) ,  lead  slags MR  1883-84,  pp  440-462 
Iliamna  and  Clark  lakes  in  Alaska,  notes  on Alaska  (2),  p  118 
Ilicinese  from  Alaska Ann  17,  i,  p  889 
from  Dakota  group Mon  xvn,  pp  176-179 
Illinoian  drift  sheet  and  associated  deposits  in  area  of  Illinois  glacial  lobe Mon 
xxxvin,  pp  24-118 
in  Danville  quadrangle GF  67,  p  4 
Illinois,  altitudes  in.     (See  "elevations"  under  this  State.) 
artesian  wells  at  Rockford Ann  11,  n,  p  262 
Big  Muddy  River  drainage  basin Mon  xxxvin,  pp  526-527 
boundary  lines  of,  and  formation  of  from  territory  northwest  of  Ohio 
River Bull  13,  pp  28,  29, 113;  Bull  171,  p  119 
Buffalo  Hart  moraine Mon  xxxvin,  pp  74-76 
building  stone  from,  statistics  of MR  1882,  p  451;  MR  1886,  pp 
540,  542;  MR  1887,  p  515;  MR  1888,  p  540;  MR  1889-90,  pp 
374,  388-390;  MR  1891,  pp  461,  462,  464,  465;  MR  1892,  pp 
710,  711;  MR  1893,  pp  553,556;  Ann  16,  iv,  p  437  et  seq; 
Ann  17,  in  cont,  pp  760,  775  et  seq;  Ann  18,  v  cont,  pp  950, 
1012  et  seq;  Ann  19,  vi  cont,  pp  206,264  et  seq;  Ann  20, 
vi  cont,  pp  271,  336  et  seq;  Ann  21,  vi  cont,  p  335  et  seq 
cement  production  of MR  1892,  pp  739,  744;  MR  1893,  p  619;  Ann  16,  iv,  pp 
577, 581;  Ann  17,  in  cont,  pp  884,  885,  891;  Ann  18,  v  cont, 
pp  1170,  1178;  Ann  19,  vi  cont,  pp  487,  492,495;  Ann  20, 
vi  cont,  pp  539,544,547;  Ann  21,  vi  cont,  pp  393,  400, 407 
Chicago,  deaths  in,  resulting  from  typhoid  fever WS  22,  p  40 
