382  BIBLIOGRAPHY    OF    NORTH    AMERICAN    GEOLOGY. 
Young  (George  A.) — Continued. 
2.  On  surveys  between  Rabbit  and  Temagami  lakes  [Ontario]. 
Can.  Geol.  Surv.,  Summ.  Rept.  for  1904,  pp.  195-198,  1905. 
Gives  observations  on  the  geology  and  petrology  of  the  region  examined. 
Young  (L.  E.),  Beyer  (S.  W.)  and. 
1.  Geology  of  Monroe  County,  Iowa. 
See  Beyer  (S.  W.)  and  Young  (L.  E.),  1. 
Yung  (Morrison  B. )  and  McCafFery  (Richard  S. ). 
1.  The  ore  deposits  of  the  San  Pedro  district,  New  Mexico. 
Am.  Inst.  Mg.  Engrs.,  Trans.,  vol.  33,  pp.  350-362,  7  figs.  1903;  Eng.  &  Mg.  Jour.,  vol.  75,  pp. 
297-299,  4  figs.,  1903. 
Describes  the  general  geology  of  the  region,  and  the  occurrences,  geologic  relations,  and 
character  of  the  copper,  silver-lead,  and  gold  deposits. 
Z. 
Zirkel  (Ferdinand). 
1.   Ueber  die  gegenseitigen  Beziehungen  zwischen  der  Petrographie  und  angrenzen-  I 
den  Wissenschaften. 
Jour.  Geol.,  vol.  12,  pp.  485-500,  1904. 
Discusses  the  scope  and  methods  of  petrography  and  relations  to  connected  sciences. 
