380  BIBLIOGRAPHY    OF    NORTH    AMERICAN    GEOLOGY 
"Wright  (Albert  A.)— Continued. 
2.  Ohio  boulders  containing  "  huronite." 
Ohio  State  Acad.  Sci.,  5th  Ann.  Rept,  pp.  60-61, 1897. 
Wright  (Charles  W.). 
1.  The  Porcupine  placer  mining  district,  Alaska. 
U.  S.  Geol.  Surv.,  Bull.  no.  225,  pp.  60-63,  1904. 
Describes  briefly  the  general  geology  and  the  occurrence  and  mining  of  placer  gold. 
2.  The  Porcupine  placer  district,  Alaska. 
U.  S.  Geol.  Surv.,  Bull.  no.  236,  35  pp.,  10  pis.,  4  figs.,  1904. 
Describes  the  general  geology,  the  character  and  occurrence  of  placer  gold  deposits,  and  the 
mining  operations. 
Wrig-ht  (Charles  W.),  Wrig-ht  (F.  E.)  and. 
1.  Economic  developments  in  southeastern  Alaska. 
See  Wright  (F.  E.)  and  Wright  (C.W.),  1. 
Wright  (Fred  Eugene). 
1.  A  new  combination  wedge  for  use  with  the  petrographical  microscope. 
Jour.  Geol.,  vol.  10,  pp.  33-35,  1  fig.,  1902. 
2.  Two  microscopic-petrographical  methods. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  17,  pp.  385-391,  6  figs.,  1904. 
Describes  methods  of  determining  index  of  refraction  and  optical  character  of  minerals. 
3.  Der  Alkalisyenit  von  Beverly,  Massachusetts,  U.  S.  A. 
Tschermak's  Min.  u.  Petrogr.  Mitt.,  N.  F.,  Bd.  19,  pp.  308-320,  11  figs.,  1900. 
Describes  crystallographic  characters  and  composition  of  an  alkali-syenite  from  Beverly, 
Massachusetts. 
4.  Report  of  progress  in  the  Porcupines  [Michigan]. 
Mich.  Geol.  Surv.,  Ann.  Rept.  for  1903,  pp.  33-44,  1905. 
Describes  the  field  work  of  1903  and  gives  notes  upon  the  geology. 
5.  The  determination  of  the  optical  character  of  bi-refracting  minerals. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  20,  pp.  285-296,  6  figs.,  1905. 
6.  Notes  on  the  rocks  and  minerals  of  Michigan.     To  accompany  the  loan  collection 
issued  by  the  Michigan  College  of  Mines. 
Houghton,  1905.  105  pp.,  2  pis.,  11  figs. 
Wright  (F.  E.)  and  Wright  (C.  W.). 
1.   Economic  developments  in  southeastern  Alaska. 
U.  S.  Geol.  Surv.,  Bull.  no.  259,  pp.  47-68,  1905. 
Describes  the  general  geology  and  the  character  and  occurrence  of  placer  gold  deposits. 
Wright  (Frederick  Bennett). 
1.  The  mastodon  and  mammoth  contemporary  with  man. 
Records  of  the  Past,  vol.  2,  pp.  243-253,  illus.,  1903. 
Wright  (G.  Frederick). 
1.  Report  of  the  boulder  committee  of  the  Ohio  State  Academy  of  Sciences. 
Ohio  State  Acad.  Sci.,  2d  Ann.  Rept.,  pp.  5-10  [1894]. 
Discusses  source  and  distribution  of  glacial  bowlders. 
2.  Report  of  the  boulder  committee  of  the  Ohio  State  Academy  of  Sciences. 
Ohio  State  Acad.  Sci.,  3d  Ann.  Rept.,  pp.  6-7  [1895]. 
Discusses  distribution  and  source  of  glacial  bowlders  in  Ohio. 
3.  The  rate  of  lateral  erosion  at  Niagara. 
Am.  Geol.,  vol.  29,  pp.  140-143,  1  pi.,  2  figs.,  1902. 
Gives  the  results  of  measurements  to  determine  the  rate  at  which  the  face  of  the  gorge  crum- 
bles away  under  the  influence  of  subaerial  agencies. 
4.  The  age  of  the  Lansing  skeleton. 
Records  of  the  Past,  vol.  2,  pp.  119-124,  illus.,  1903. 
5.  Glacial  man. 
Records  of  the  Past,  vol.  2,  pp.  259-271,  illus..  1903. 
