160  BIBLIOGRAPHY    OF    NORTH    AMERICAN    GEOLOGY 
Headden  (William  P. )— Continued. 
2.  Significance  of  silicic  acid  in  waters  of  mountain  streams. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  16,  pp.  169-184,  1903. 
3.  The  Doughty  springs,  a  group  of  radium-bearing  springs,  Delta  County,  Colorado. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  19,  pp.  297-309,  1905. 
4.  Mineralogical  notes,  no.  2. 
Colo.  Sci.  Soc,  Proa,  vol.  8,  pp.  53-70,  1905. 
Describes  the  characters  and  composition  of  minerals  from  various  localities. 
Hedburg-  (Eric). 
1.  The  Missouri  and  Arkansas  zinc  mines  at  the  close  of  1900. 
Am.  Inst.  Mg.  Engrs.,  Trans.,  vol.  31,  pp.  379-404,  5  figs,  (map  and  sections),  and  discussion, 
pp.' 1022-1023,  1902. 
Reviews  the  mining  industry  of  this  district,  and  discusses  geologic  position  and  origin  of 
the  ores. 
Heilprin  (Angelo). 
1.  Fossils  and  their  teachings. 
Sci.  Am.  Suppl.,  vol.  52,  pp.  21472-21473,  1901. 
2.  How  to  interpret  the  facts  of  geology. 
Sci.  Am.  Suppl.,  vol.  52,  pp.  21488-21489,  1901. 
Abstract  of  lecture  delivered  before  the  Philadelphia  Academy  of  Natural  Sciences. 
3.  Mont  Pelee  and  the  tragedy  of  Martinique. 
Philadelphia,  J.  B.  Lippincott  Company,  1903.     xiii,  325  pp.,  illus. 
4.  The  activity  of  Mont  Pelee. 
Science,  new  ser.,  vol.  17,  p.  546,  1903. 
5.  The  ascending  obelisk  of  the  Montagne  Petee. 
Pop.  Sci.  Monthly,  vol.  63,  pp.467-46H,  1  tig.,  1903. 
6.  The  ascending  obelisk  of  the  Montagne  Pelee. 
Science,  new  ser.,  vol.  18,  pp.  184-185,  1903. 
7.  Mont  Pelee— the  eruptions  of  August  24  and  30,  1902. 
Abstract:  Science,  new  ser.,  vol.  17,  p.  226,  1903;  Sci.  Am.  Suppl.,  vol.  55,  p.  22647,  1903. 
8.  The  nature  of  the  Pelee  tower. 
Science,  new  ser.,  vol.  19,  pp.  800-801,  1904. 
Discusses  the  mode  of  formation  of  the  spine  of  Mont  Pelee. 
9.  The  tower  of  Pelee:  new  studies  of  the  great  volcano  of  Martinique. 
Philadelphia,  J.  B.  Lippincott  &  Co.,  1904.    62  pp.,  23  pis.,  4to. 
10.  Tower  of  Pelee. 
Abstract:  Intern.  Geog.  Cong.,  Eighth,  Rept.,  p.  446,  1905. 
11.  Uniformity  in  mountain  elevations. 
Am.  Geog.  Soc,  Bull.,  vol.  37,  pp.  726-729,  1905. 
Heine  (R.  E.). 
1.  The  water  resources  of  Washington.     Water  power. 
Wash.  Geol.  Surv.,  vol.  1,  Ann.  Rept.  lor  1901,  pp.  308-320,  3  pis.,  1902. 
Heiney  (Win.   M.). 
1.  River  bends  and  bluffs  [Indiana]. 
Ind.  Acad.  Sci.,  Proc.  for  1900,  pp.  197-200,  3  tigs.,  1901. 
Henderson  (David  B. ). 
1.  Powell  as  a  soldier. 
Wash.  Acad.  Sci.,  Proc,  vol.  5,  pp.  100-105,  1903. 
Henderson  (Junius). 
1.  The  overturns  in  the  Denver  basins  [Colorado]. 
Jour. Geol.,  vol.11,  pp. 584-586,  2  figs.,  1903;  Colo.  Univ.,  Studies,  vol.1,  pp. 345-347,  2  figs.,  1901. 
Gives  an  explanation  of  the  overturning  of  strata  in  this  region. 
