482 
IX1VKX    TO    NORTH    AMERICAN    GEOLOGY 
Economic  geology— Continued. 
6  eneral — Continued. 
Origin  of  petroleum,  coal,  etc.,  Plotts,  1. 
Origin  of  the  Coal   Measure  fire   clays. 
Hopkins  (T.  C).  -• 
Origin  of  vein  cavities,  Nason.  3. 
Origine  eolienne  du  loess,  Keyes,  17. 
Osmosis   as   .-i   factor  in   ore  formation, 
Gillette,  1. 
Peat  and  its  relation  to  coal,  Lakes,  96. 
Petroleum,  Baxter.  1. 
Petroleum.  Oliphant,  2. 
Petroleum   in   western    North    America, 
Lakes,  14. 
Phase-rule  and   conceptions   of   igneous 
magmas,    I>.-iy   and   Shepherd,   1. 
Phosphate     mining     industry     of     the 
United    States.    Memminger,    1. 
Precious  stones   in    the    United    States, 
Kunz.  2. 
Preliminary     list     of    deep     borings     in 
United  Slates.  Darton,  5,  6. 
Present    standing    of    applied    geology, 
Ransome,  15. 
Principles    controlling    the    deposition 
of  ores,  Van  I  [ise,  1.  8. 
.  Problem  of  metalliferous  veins.  Kemp, 
35. 
Problems    in    geology    of    ore    deposits, 
Vogt,  1. 
Production    of    gold    in    United    States 
in  Dill.  landmen.  25. 
Pn  du«  i  ion     of    silver    in     the     United 
States  in   1904,  Lindgren,  26. 
Progress  of  economic  geology   in    1905, 
Bain,  18. 
Prospecting  for  coal   in  western   Stales, 
Lakes.   31. 
Recent     contributions     to     the    science 
of  ore  deposits,  Raymond  I  R.  W.  i,  1. 
Recent   progress  in  study  of  ore  depos- 
its. Rickard   (T.  A.),    1. 
Review  of  analyses  of  r<n-t land-cement 
materials.  Hillebrand,  3. 
Relation   of  geology   to   the  mining   in- 
dustry.  Laws  'U    i  A.   ( '.  i.  12. 
Rock    segregation    and    ore    deposition, 
Spurr,   10. 
Rock    segregation    and    ore    deposition, 
Stevens   (15.1.  2. 
Rocky     Mountain     coal     fields.     Lakes, 
79. 
Role  of  igneous  rocks   in  formation   of 
veins,  Kemp,  9. 
Schists    and     slates    as    ore    carriers, 
Lakes,  70. 
Science  of  raw  materials.  Lane.  29. 
Scope  of  applied  geology.  Johnson   (D. 
W.),  10. 
Secondary   enrichment,   Burgess.    1 . 
Secondary  enrichment,  Purington,  4. 
Secondary  enrichment   in   arid    regions, 
Starbird,  1. 
Secondary  enrichment  of  mineral  veins. 
Herrick  (C.  L.),  2. 
Secondary   enrichment  of  ore  deposits, 
Emmons  (S.  F.),  1. 
Economic  geology — Continued. 
General— Continued. 
Secondary   enrichment  of  ore  deposits, 
Lakes,  46. 
Secondary   enrichment   of  ore  deposits, 
Smith   (G.),  1. 
Secondary   enrichment   in   ore   deposits 
of  copper,  Kemp,  33. 
Shear   zones   or   zones  of  impregnation 
vs.  true  quartz  fissure  veins,   Lakes, 
78. 
Southern  copper  deposits,  Weed,  10. 
Stones     for    building    and     decoration, 
Merrill    (G.   I'.),  11. 
Study   of  stratigraphy.    Parks,    7. 
Sulphur   deposits   of   Calcasieu    Parish, 
Kerr,  1. 
Summaries    of    literature    of    economic 
geology.  Eckel,  12. 
Summaries  of  literature  of  structural 
materials.  Eckel.  9,  10. 
Syncline  as  a  structural  type,  Rickard 
(T.  A.).   10. 
Theories    of    ore    deposition,    Emmons 
(S.  E.i.  15. 
Theory   of  copper  deposition,  Lane,  28, 
44. 
Theory  of  ore  deposits  applied  to  pros- 
peel  'mil;'.    Wilson    (10.   B.).   1. 
Tin  deposits  of  the  world,  Fawns,  1. 
Tin  in  the  United  States,  Garrison,  3. 
Training     of     engineers     in     economic 
geology,  Brainier.  !t. 
Trenton  rock  petroleum,  Blatchley  and 
Sheak.  1. 
Underground    water    circulation,    Crbss 
(C.    M.l.   1. 
United  States  Geological  Survey  in  its 
relation  to  the  practical  miner,  Em- 
mons  (S.  E.),  7. 
Utilization    of    iron    and    steel    slags, 
Eckel,  17. 
Virginias  mine.  Emmons  I  S.  E. ).  16. 
Volcanic      craters     and      ore   deposits, 
Lakes.   77. 
Volcanic    origin    of    natural    gas    and 
petroleum,  Bell    (Robert),  0. 
Volcanic    origin    of    natural    gas    and 
petroleum,  Coste,  1,  2. 
Volcanic    origin    of    natural    gas    and 
petroleum,  Mickle,  2. 
Volcanic  origin  of  oil,  Coste,  3. 
Water  in  veins.  Rickard   (T.  A.),  9. 
What    constitutes   a   clay,    Merrill    (G. 
P.),  5. 
What  is  a  fissure  vein?  Kemp,  34. 
What  is  a  fissure  vein?    Raymond   (R. 
W.).  4. 
What  is  a  fissure  vein?  Spencer  (A.  C), 
16. 
Zinc  deposits,  Lakes,  52. 
Zone     of    maximum     richness     in    ore 
bodies,  Keyes,  12. 
Economic  products  described. 
Abrasive  materials,  Hopkins  (T.  C. »,  3. 
Abrasives,  Day,  6-11. 
Abrasives,  Magnus,   1. 
