warman.]  IRON IRRIGATION.  411 
iron  ore,  chromic,  statistics  of Ann  19,  vi,  pp  259-264;  Ann  20,  vi,  pp  291-292 
typical  analyses  of,  in  bulk Ann  17,  in,  p  263 
Iron  ore,  fossiliferous,  description  of  the  rock,  as  one  of  the  educational  series. .  .Bull 
150,  pp  138-140 
Iron  ore,  purple,  composition  of MR  1883-84,  p  898 
Iron  ore  and  its  products - - MR  1882,  pp  108-144 
Iron-ore  industry,  bibliography  of Ann  16,  in,  pp  217-218 
Iron-ore  knobs  of  Texas Ann  21,  vn,  pp  295-296 
Iron-ore  series  of  Potomac  formation Ann  15,  pp  330-332 
Iron  pyrite,  of  Colorado,  in  veins  of  Telluride  district Ann  18,  in,  pp  790-793 
of  Porto  Rico,  occurrence  of Ann  20,  vi  cont,  p  785 
thin  section  of,  from  Colorado,  Telluride  quadrangle Ann  18,  in,  pp  850-851 
Iron  sow  or  salamander,  analysis  of,  from  Colorado,  Leadville  district-  .Mon  xn,  p  723 
Ironclad  Hill,  Cripple  Creek  district  of  Colorado,  ore  deposits  in,  character  of. .  Ann  16, 
ii,  pp  172-173 
Ironclad  and  Globe  hills,  Colorado,  rocks  of Ann  16,  n,  pp  94-95 
Ironstone,  analysis  of,  from  Alabama,  Warrior  field  (clay) MR  1882,  p  159 
analysis  of,  from  Colorado,  Denver  Basin  and  near  Trinidad Mon  xxvn,  p  66 
Ironwood  formation  of  Lake  Superior  region \nn  21,  in,  pp  341-351 
Iroquois,  Lake,  the  glacial,  extent,  etc.,  of Mon  xxv,  pp  255-264 
Irrigation,  alkali  and  drainage  as  related  to Ann  13,  in,  pp  127-130 
animal  motive  powers  used  in WS  1,  pp  20-25 
areas  irrigated  in  arid  region  of  United  States,  map  showing.  .Ann  11,  n,  pp  ii-iii 
in  United  States,  table  <  >f,  1  >y  States Ann  11,  n,  p  205 
areas  irrigated  and  irrigable  in  United  States Ann  13,  in,  pp  8-10 
areas  irrigated,  forests,  and  woodlands  in  Western  States,  relative  location 
and  areas  of Ann  16,  n,  pp  480-483 
arid  region  of  United  States,  location  of,  and  cause  of  aridity Ann  12, 
ii,  pp  219-220 
artesian  wells  as  means  of Ann  5,  pp  148-150;  Ann  11,  n,  pp  257-278 
canals,  conveyance  of  water  in  flumes,  pipes,  and WS  43 
escapes  of Ann  13,  in,  pp  244-249 
headworks  of Ann  13,  in,  pp  218-238 
falls  and  rapids  of Ann  13,  in,  pp  249-256 
cost  and  value  of  water  supply  in  western  United  States Ann  13,  in,  pp  30-31 
cost,  average,  by  pumping  and  by  gravity,  comparisons  of WS  1,  p  16 
dams  for  directing  water Ann  13,  in,  pp  234-238 
for  reservoirs Ann  13,  in,  pp  321-325 
rock  fill,  hydraulic,  masonry,  etc Ann  18,  iv,  pp  627-726 
drainage  basins,  classification  of Ann  12,  n,  pp  232-234 
in  western  United  States Ann  13,  in,  pp  31-34 
duty  of  water Ann  13,  in,  pp  155-158 
in  southern  California  and  elsewhere Ann  19,  iv,  pp  543-548 
engineering,  American Ann  13,  in,  pp  101-349 
engineering,  results  of  surveys  in  1889-1892 Ann  13,  in,  pp  351-427 
engines,  hot-air,  gasoline,  and  steam,  use  of WS  1,  pp  45-50 
financial  and  economic  aspects  of Ann  13,  in,  pp  121-132 
floods,  relative  amount,  time,  and  intensity  of Ann  12,  n,  pp  227-230 
fluctuations  of  various  rivers  and  lakes Ann  13,  in,  pp  15-25 
flumes,  siphons,  etc Ann  13,  in,  pp  256-267 
ground  water Ann  13,  in,  pp  28-30 
motion  of,  theoretical  investigation  of Ann  19,  n,  pp  295-384 
movements  of,  principles  and  conditions  of Ann  19,  n,  pp  59-294 
ground-water  supplies  for Ann  13,  in,  pp  326-332 
humidity  as  affected  by Ann  12,  n,  p  234 
