98  BIBLIOGRAPHY    OF    NORTH    AMERICAN    GEOLOGY 
Dean  (Bashford) — Continued. 
5.  Biometric  evidence  in  the  problem  of  the  paired  limbs  of  the  vertebrates. 
Am.  Nat.,  vol.  36,  pp.  837-846,  1  fig.,  1902. 
Discusses  studies  of  the  development  of  paired  limbs. 
6.  The  preservation  of  muscle-fibres  in  sharks  of  the  Cleveland  shale. 
Am.  Geol.,"  vol.  30,  pp.  273-278,  2  pis.,  1902. 
Discusses  the  processes  by  which  the  delicate  structures  are  preserved. 
7.  [Review  of]  'Bibliography  and  Catalogue  of  the  Fossil  Vertebrata  of  North  Amer- 
ica,' by  Oliver  Perry  Hay. 
Science,  newser.,  vol.  16,  pp.  701-703,  1902. 
Contains  critical  notes  on  nomenclature  and  paleontology. 
8.  The  early  development  of  sharks  from  a  comparative  standpoint. 
Abstract:  N.  Y.Acad.  Sci.,  Ann.,  vol.  15,  pp.  45-46,  1903. 
Deckert  (Emil). 
1.  Die  Erdbebenherde  und  Schuttergebiete  von  Nord-Amerika  in  ihren  Beziehun- 
gen  zu  den  morphologis'chen  Verhaltnissen. 
Berlin  Ges.  fur  Erdkunde,  Zeitsch.,  1902,  no.  5,  pp.  367-389,  1902. 
A  general  discussion  of  the  occurrences  of  earthquakes  in  North  America  with  reference  to 
their  morphological  relationships. 
2.  Martinique  und  sein  Vulkanismus. 
Petermanns  Mittheilungen,  Band  48,  pp.  133-136,  1  pi.  (map),  1902. 
Gives  a  description  of  Martinique  and  the  volcanic  eruption  of  Mont  Pele\ 
De  Cou  (Ralph  E.),  Downer  (R.  H. )  and. 
1.  A  description  of  the  working  mines  of  Ouray  County,  Colorado. 
See  Downer  (R.  H.)  and  De  Cou  (R.  E.),  1. 
Demaret  (Loon). 
1.  Les  principaux  gisements  de  minerals  de  zinc  des  Etats-Unis  d'Amerique. 
Revue  universelle  des  Mines  [Liege  and  Paris],  4e  s6r.,  t.  6,  pp.  221-256,  6  pis.,  1904. 
Describes  the  principal  deposits  of  zinc  ore  in  the  United  States,  including  observations  on 
the  character,  occurrence,  geologic  relations,  origin,  etc. 
2.  Les  principaux  gisements  des  minerals  de  mercure  du  monde. 
Annales  des  Mines  de  Belgique,  t.  9,  80  pp.,  3  pis.,  28  figs.,  1904. 
Gives  an  account  of  the  deposits  of  quicksilver  ores  in  the  world,  their  occurrence,  geologic 
relations,  production,  etc.    In  the  United  States  deposits  in  California,  Oregon,  and  Texas 
are  considered. 
Denis  (Theo.). 
1.  The  coal  fields  of  Canada. 
Can.  Geol.  Surv.,  Ann.  Rept.,  vol.  15,  Part  S,  pp.  53-93,  1904. 
Denis  (Theo.),  Ingall  (E.  D.)  and. 
1.  Geology  of  the  country  around  Bruce  mines  [Ontario]. 
See  Ingall  (E.  D.)  and  Denis  (T.),  1. 
Dennis  ( W.  B. ) 
1.  A  borax  mine  in  southern  Oregon. 
Eng.  &  Mg.  Jour.,  vol.  73,  pp.  581-582,  2  figs.,  1902. 
Contains  brief  description  of  the  deposit. 
2.  The  quicksilver  deposits  of  Oregon. 
Eng.  &  Mg.  Jour.,  vol.  76,  pp.  539-541,  1903. 
Describes  the  occurrence,  character,  and  geologic  relations  of  the  quicksilver-ore  deposits  of 
Oregon  and  the  mining  developments.  S 
Dern  (George  H.). 
1.  The  geology  of  Mercur  [Utah].     A  history  of  the  region.     Description  of  the 
ores  and  their  peculiar  formations.     How  they  were  deposited. 
Mines  &  Minerals,  vol.  24,  pp.  543-545,  3  figs.,  1901. 
Describes  the  general  geology,  the  occurrence  and  character  of  the  gold  and  silver  ledges,  and 
discusses  the  origin  of  the  ores. 
