﻿IV 
  CONTENTS. 
  

  

  Number 
  50. 
  

  

  Page 
  

   Art. 
  VIII 
  — 
  Sedimentary 
  Rocks 
  of 
  Southern 
  Patagonia 
  ; 
  by 
  

  

  J. 
  B. 
  Hatcher. 
  (With 
  Plate 
  I) 
  85 
  

  

  IX. 
  — 
  Explorations 
  of 
  the 
  "Albatross" 
  in 
  the 
  Pacific. 
  II. 
  

  

  The 
  Paumotus 
  ; 
  by 
  A. 
  Agassiz 
  1 
  09 
  

  

  X. 
  — 
  Action 
  of 
  Ammonium 
  Chloride 
  upou 
  Analcite 
  and 
  

  

  Leucite 
  ; 
  by 
  F. 
  W. 
  Clarke 
  and 
  G. 
  Steiger 
  . 
  117 
  

  

  XL 
  — 
  Devonian 
  Strata 
  in 
  Colorado 
  ; 
  by 
  A. 
  C. 
  Spencer 
  125 
  

  

  XII. 
  — 
  Sphalerite 
  Crystals 
  of 
  a 
  peculiar 
  habit 
  and 
  with 
  one 
  

  

  New 
  Form, 
  from 
  Galena, 
  Kansas 
  ; 
  by 
  A. 
  F. 
  Rogers. 
  134 
  

  

  XIII. 
  —Estimation 
  of 
  Thallium 
  as 
  the 
  acid 
  and 
  neutral 
  Sul- 
  

   phates 
  ; 
  by 
  P. 
  E. 
  Browning 
  137 
  

  

  XIV. 
  — 
  Motion 
  of 
  a 
  Submerged 
  Index 
  Thread 
  of 
  Mercury 
  in 
  

  

  the 
  Lapse 
  of 
  Time 
  ; 
  by 
  C. 
  Barus 
  - 
  139. 
  

  

  SCIENTIFIC 
  INTELLIGENCE. 
  

  

  Chemistry 
  and 
  P/iysics 
  — 
  Third 
  Radio-active 
  substance 
  in 
  Pitchblende, 
  Debierne: 
  

   Spectrum 
  of 
  Radium, 
  DEMARgAY, 
  143. 
  — 
  Atomic 
  Mass 
  of 
  Radio-active 
  Barium 
  

   Chloride, 
  Curie, 
  144. 
  — 
  Chemical 
  Effects 
  produced 
  by 
  Becquerel 
  Rays, 
  Curie, 
  

   145. 
  — 
  Chemical 
  Action 
  of 
  X-Rays, 
  Villard 
  : 
  New 
  Element 
  Victorium, 
  Crookes 
  : 
  

   Elements 
  of 
  Physics, 
  H. 
  Crew, 
  146. 
  — 
  Modes 
  Operatoires 
  des 
  Essais 
  du 
  Com- 
  

   merce 
  et 
  de 
  lTndustrie: 
  Radio-active 
  Substances. 
  H. 
  Becquerel: 
  Deviation 
  of 
  

   the 
  Becquerel 
  rays 
  in 
  the 
  magaetic 
  field, 
  F. 
  Giesel, 
  147. 
  — 
  Velocity 
  and 
  suscep- 
  

   tibility 
  to 
  magaetic 
  action 
  of 
  the 
  Cathode 
  rays, 
  E. 
  Wiechert: 
  Limits 
  of 
  hear- 
  

   ing, 
  R. 
  Koenig: 
  Method 
  of 
  showing 
  periodic 
  current 
  curves, 
  A. 
  Wehnelt 
  and 
  

   B. 
  Donath, 
  148. 
  

  

  Geology 
  and 
  Natural 
  History 
  — 
  Geological 
  and 
  Natural 
  History 
  Survey 
  of 
  Minne- 
  

   sota, 
  N. 
  H. 
  Winchell, 
  149. 
  — 
  Revision 
  of 
  the 
  Genera 
  and 
  Species 
  of 
  Canadian 
  

   Palaeozoic 
  Corals, 
  the 
  Madreporaria 
  Perforata 
  and 
  the 
  Alcyonaria, 
  L. 
  M. 
  Lambe, 
  

   155. 
  — 
  Geological 
  Survey 
  of 
  Canada: 
  Geological 
  Society 
  of 
  America, 
  Cordil- 
  

   leran 
  Section 
  : 
  Key 
  to 
  the 
  Upper 
  Devonian 
  of 
  Southern 
  New 
  York, 
  G. 
  D. 
  

   Harris, 
  156. 
  — 
  Principles 
  and 
  Conditions 
  of 
  the 
  Movements 
  of 
  Ground 
  Water, 
  

   King 
  and 
  Slighter: 
  Geologic 
  Atlas 
  of 
  the 
  United 
  States 
  — 
  Absaroka 
  Folio. 
  

   Wyoming, 
  A. 
  Hague, 
  157. 
  — 
  Preliminary 
  Notice 
  of 
  the 
  Etcheminian 
  Fauna 
  of 
  

   Cape 
  Breton, 
  G. 
  F. 
  Matthew: 
  Recent 
  Foraminifera, 
  J. 
  M. 
  Flint, 
  158.— 
  Guida 
  

   al 
  Corso 
  de 
  Mineralogia, 
  A. 
  D'Achiardi, 
  160. 
  

  

  Obituary 
  — 
  Thomas 
  Egleston, 
  160, 
  

  

  