FOE    THE    YEARS    1901-1905,   INCLUSIVE.  151 
Halse  ( Ed  ward )  — Continued . 
3.  Gems  and  precious  stones  of  Mexico. 
Am.  Inst.  Mg.  Engrs.,  Trans.,  vol.  32,  pp.  568-569,  1902. 
Contains  not9s  on  the  occurrence  of  precious  stones  in  Mexico. 
4.  Some  silver-bearing  veins  of  Mexico. 
Inst.  Mg.  Engrs.,  Trans.,  vol.  18,  pp.  370-381,  1900;  vol.  21,  pp.  198-213,  2  pis.,  1901;  vol.  23,  pp. 
213-257,  2  pis.,  1902;  vol.  21,  pp.  41-60,  1903;  vol.  27,  pp.  169-189,  1904. 
Contains  observations  upon  the  geology  and  occurrence  of  silver  ores. 
5.  The  occurrence  of  pebbles,  concretions,  and  conglomerates  in  metalliferous  veins. 
Am.  Inst.  Mg.  Engrs.,  Bi-mo.  Bull.  no.  4,  pp.  719-742,  13  figs.,  1905. 
Hambach  (Gustav). 
1.  Revision  of  the  Blastoidese,  with  a  proposed  new  classification,  and  description  of 
new  species. 
St.  Louis  Acad.  Sci.,  Trans.,  vol.  13,  pp.  1-67,  5  pis.,  15  figs.,  1903. 
Hamilton  (8.  Harbert). 
1.  Troost's  survey  of  Philadelphia. 
Am.  Geol.,  vol.  27,  pp.  41-42,  1901. 
Calls  attention  to  the  location  of  a  copy  of  Dr.  Gerard  Troost's  publication  on  the  survey  of 
the  environs  of  Philadelphia. 
2.  [Notes  on  the  geology  and  physiography  of  Cuba.] 
Phila.  Acad.  Nat,  Sci.,  I'roe.,  vol.  54,  pp.  744-749,  1902. 
Hamilton  (S.  Harbert )  and  Withrow  (James  R. ). 
1.  The  progress  of  mineralogy  in  1899,  an  analytical  catalogue  of  the  contributions  to 
that  science  published  during  the  year. 
Am.  Inst.  Mg.  Engrs.,  Bull.  no.  2,  96  pp.,  1900.     Abstract:  Am.  Geol.,  vol.  27,  p.  48,  1901. 
Hamilton  (W.  R.),  Kessler  (H.  H.)  and. 
1.  The  orbicular  gabbro  of  Dehesa,  California. 
See  Kessler  (H.  H.)  and  Hamilton  (W.  R. ),  1. 
Hanbury  (David  T.). 
1.  Through  the  barren  ground  of  northeastern  Canada  to  the  Arctic  coast. 
Geog.  Jour.,  vol.  32,  pp.  178-191,  illus.,  1903. 
Contains  a  brief  account  of  the  geology  of  the  region  traversed. 
Hanks  (Henry  G.). 
1.  The  deepdying  auriferous  gravels' and  table  mountains  of  California. 
San  Francisco,  1901.     15  pp.,  6  pis. 
Hardman  (John  E. ). 
1.  A  new  mineral  area  in  Ontario. 
Can.  Mg.  Rev.,  vol.  24,  pp.  95-98,  157-158,  10  figs.,  1905. 
Gives  notes  on  the  geology  of  western  Ontario  and  the  occurrence  of  mineral  deposits. 
Harper  (Henry  Winston). 
1.  A  contribution  to  the  chemistry  of  some  of  the  asphalt  rocks  found  in  Texas. 
Texas  Univ.  Mineral  Surv.,  Bull.  no.  3,  pp.    08-129,  2  pis.,  1902. 
Discusses  the  nomenclature  of  asphalt  and  presents  the  results  of  analyses  of  many  samples. 
Harper  (Roland  M.). 
1.  Taxodium  distichum  and  related  species,  with  notes  on  some  geological  factors 
influencing  their  distribution. 
Torrey  Bot.  Club,  Bull.,  vol.  29,  pp.  381-399,  1902. 
Discusses  the  influence  of  certain 'geologic  formations  upon  the  geographic  distribution  of 
these  plants. 
2.  Notes  on  the  Lafayette  and  Columbia  formations  and  some  of  their  botanical 
features. 
Science,  new  ser.,  vol.  16,  pp.  68-70,  1902. 
Discusses  the  use  of  plants  growing  in  soils  derived  from  these  formations  in  identifying  the 
presence  of  the  latter  where  surface  outcrops  are  not  available. 
