﻿IV 
  CONTENTS. 
  

  

  Number 
  212. 
  

  

  Page 
  

  

  Art. 
  XI. 
  — 
  Velocities 
  of 
  Delta 
  Rays 
  ; 
  by 
  H. 
  A. 
  Bumstead 
  91 
  

  

  XII. 
  — 
  Banded 
  Gneisses 
  of 
  the 
  Laurentian 
  Highlands 
  of 
  

  

  Canada 
  ; 
  by 
  M. 
  E. 
  Wilson 
  109 
  

  

  XIII. 
  — 
  Deep 
  Wells 
  at 
  Findlay, 
  Ohio 
  ; 
  by 
  D. 
  D. 
  Condit 
  ... 
  123 
  

  

  XIV. 
  — 
  Note 
  on 
  the 
  Temperature 
  in 
  the 
  Deep 
  Boring 
  at 
  

  

  Findla}', 
  Ohio 
  ; 
  by 
  J 
  Johnston 
  131 
  

  

  XY. 
  — 
  Arc 
  Spectrum 
  of 
  Tellurium 
  ; 
  by 
  H. 
  S. 
  Uhler 
  and 
  

  

  R. 
  A. 
  Patterson 
  135 
  

  

  XVI.— 
  La 
  Paz 
  (Bolivia) 
  Gorge 
  ; 
  by 
  H. 
  E. 
  Gregory 
  141 
  

  

  XVII. 
  — 
  Some 
  Kilauean 
  Formations 
  ; 
  by 
  F. 
  A. 
  Perret 
  151 
  

  

  XVIII.— 
  Marked 
  Unconformity 
  between 
  Carboniferous 
  and 
  

   Devonian 
  Strata 
  in 
  Upper 
  Mississippi 
  Valley 
  ; 
  by 
  C. 
  R. 
  

   Keyes 
  ._. 
  160 
  

  

  XIX. 
  — 
  Meteoric 
  Iron 
  from 
  Paulding 
  County, 
  Georgia 
  ; 
  by 
  

  

  T. 
  L. 
  Watson... 
  165 
  

  

  XX 
  — 
  Pyroxmangite, 
  a 
  New 
  Member 
  of 
  the 
  Pyroxene 
  Group 
  

   and 
  its 
  Alteration 
  Product, 
  Skemmatite 
  ; 
  by 
  W. 
  E. 
  

   Ford 
  and 
  W. 
  M. 
  Bradley 
  . 
  169 
  

  

  XXI. 
  — 
  New 
  or 
  little 
  known 
  Paleozoic 
  Faunas 
  from 
  Wyo- 
  

   ming 
  and 
  Idaho 
  ; 
  by 
  E. 
  Blackwelder 
  174 
  

  

  XXII. 
  — 
  Solid 
  Solution 
  in 
  Minerals. 
  IV. 
  The 
  Composition 
  

   of 
  Amorphous 
  Minerals 
  as 
  illustrated 
  by 
  Chrysocolla 
  ; 
  

   by 
  H. 
  W. 
  Foote 
  and 
  W. 
  M. 
  Bradley 
  180 
  

  

  SCIENTIFIC 
  INTELLIGENCE. 
  

  

  Miscellaneous 
  Scientific 
  Intelligence 
  — 
  History 
  of 
  the 
  first 
  Half-Century 
  of 
  the 
  

   National 
  Academy 
  of 
  Sciences, 
  1863-1913, 
  185. 
  — 
  United 
  States 
  Geological 
  

   Survey, 
  186. 
  

  

  Obituary 
  — 
  E. 
  Holzapfel, 
  186. 
  

  

  