warman.]  ELEVENTH    AND    TWELFTH    ANNUAL    REPORTS.  15 
Eleventh  Annual  Report  of  the  United  States  Geological  Survey  to 
the  Secretary  of  the  Interior  1889-'90  by  J.  W.  Powell  Director 
Part  I— Geology  [-II— Irrigation]  [Vignette]  Washington  Gov- 
ernment Printing  Office     1891 
8°.  2  pts.  xv,  757  pp.,  66  pis.  and  maps;  xiv,  395  pp.,  67-96  pis.  and  maps.  Bound 
in  dark  maroon  cloth  (Survey  edition).  Out  of  stock.  Separates  of  the  various 
papers  were  issued,  in  paper  covers. 
Pt.    I.  Geology,     xv,  757  pp.,  66  pis.  and  maps. 
Report  of  the  Director,  pp.  3-30,  pi.  i. 
Administrative  reports  of  chiefs  of  divisions,  pp.  31-185. 
The  Pleistocene  history  of  northeastern  Iowa,  by  W  J  McGee,  pp.  189- 
577,  pis.  ii-lxi. 
The  natural-gas  field  of  Indiana,  by  Arthur  John  Phinney,  with  an  intro- 
duction by  W  J  McGee  on  Rock  gas  and  related  bitumens,  pp.  579- 
742,  pis.  Ixii-lxvi. 
Index,  pp.  743-757. 
Pt,  II.  Irrigation,     xiv,  395  pp.,  67-96  pis.  an. I  maps. 
Abstract  of  report,  pp.  xi-xiv. 
Hydrography,  pp.  1-110,  pis.  lxvii-lxxiv. 
Engineering,  pp.  111-200,  pis.  lxxv-xcvi. 
The  arid  lands,  pp.  201-289. 
Topography,  pp.  291-343. 
Irrigation  literature,  pp.  345-388. 
Index,  pp.  389-395. 
Twelfth  Annual  Report  of  the  United  States  Geological  Survey  to 
the  Secretary  of  the  Interior  1890-'91  by  J.  W.  Powell  Director 
Part  I— Geology  [-11— Irrigation]  [Vignette]  Washington  Gov- 
ernment Printing  Office     189] 
8°.  2  pts.  xiii,  675  pp.,  53  pis.  and  maps;  xviii,  576  pp.,  54-146  pis.  and  maps. 
Bound  in  dark  maroon  cloth  (Survey  edition).  Out  of  stock.  Separates  of  the  vari- 
ous papers  were  issued,  in  paper  covers. 
Pt.  I.  Geology,     xiii,  (575  pp.,  53  pis.  and  maps. 
Report  of  the  Director,  pp.  3-19,  pi.  i. 
Administrative  reports  of  chiefs  of  divisions,  pp.  21-210. 
The  origin  and  nature  of  soils,  by  Nathaniel  Southgate  Shaler,  pp.  213-345, 
pis.  ii-xxxi. 
The  Lafayette  formation,  by  W  J  McGee,  347-521,  pis.  xxxii-xli. 
The  North  American  continent  during  Cambrian  time,  by  Charles  1>. 
Walcott,  pp.  523-568,  pis.  xlii-xlv. 
The  eruptive  rocks  of  Electric  Peak  and  Sepulchre  Mountain,  Yellowstone 
National  Park,  by  Joseph  Paxson  Iddings,  pp.  569-664,  pis.  xlvi-liii. 
Index,  pp.  665-675. 
Pt.  II.  Irrigation,     xviii,  576  pp.,  54-146  pis.  and  maps. 
Report  upon  the  location  and  survey  of  reservoir  sites  during  the  fiscal 
year  ended  June  30,  1891,  by  A.  H.  Thompson,  chief  of  western  divi- 
sion of  topography,  pp.  1-212,  pis.  liv-lvii. 
Hydrography  of  the  arid  regions,  by  F.  H.  Newell,  pp.  213-361,  pis. 
lviii-cvi. 
Irrigation  in  India,  by  Herbert  M.  Wilson,  C.  E.,  pp.  363-561,  pls.cvii-cxlvi. 
Financial  statement,  pp.  562-568. 
Index,  pp.  569-576, 
