﻿CONTENTS. 
  

  

  Number 
  249. 
  

  

  Page 
  

  

  Art. 
  XVII. 
  — 
  Capture 
  of 
  Comets 
  by 
  Planets, 
  especially 
  their 
  

  

  Capture 
  by 
  Jupiter 
  ; 
  by 
  H. 
  A. 
  Newton 
  183 
  

  

  XVIII. 
  — 
  Pleistocene 
  Fluvial 
  Planes 
  of 
  Western 
  Pennsyl- 
  

   vania 
  ; 
  by 
  Frank 
  Leverett 
  200 
  

  

  XIX. 
  — 
  A 
  method 
  for 
  the 
  Determination 
  of 
  Antimony 
  and 
  its 
  

   condition 
  of 
  Oxidation 
  ; 
  by 
  F. 
  A. 
  Gooch 
  and 
  H. 
  W. 
  

   Gruener 
  213 
  

  

  XX. 
  — 
  A 
  Method 
  for 
  the 
  Estimation 
  of 
  Chlorates 
  ; 
  by 
  F. 
  A. 
  

  

  Gooch 
  and 
  C. 
  G. 
  Smith 
  _ 
  _ 
  . 
  _ 
  220 
  

  

  XXI. 
  — 
  Dampening 
  of 
  Electrical 
  Oscillations 
  on 
  Iron 
  Wires 
  ; 
  

  

  by 
  John 
  Trowbridge 
  223 
  

  

  XXII. 
  — 
  Genesis 
  of 
  Iron-ores 
  by 
  Isomorphous 
  and 
  Pseudo- 
  

   morphous 
  Replacement 
  of 
  Limestone, 
  etc.; 
  by 
  James 
  P. 
  

   Kimball 
  231 
  

  

  XXIII. 
  — 
  Constitution 
  of 
  certain 
  Micas, 
  Vermiculites 
  and 
  

  

  Chlorites 
  ; 
  by 
  F. 
  W. 
  Clarke 
  and 
  E. 
  A. 
  Schneider 
  242 
  

  

  XXIV. 
  — 
  A 
  Further 
  Note 
  on 
  the 
  Age 
  of 
  the 
  Orange 
  Sands 
  ; 
  

  

  by 
  R. 
  D. 
  Salisbury 
  252 
  

  

  XXV. 
  — 
  Note 
  on 
  the 
  Causes 
  of 
  the 
  Variations 
  of 
  the 
  Mag- 
  

   netic 
  Needle 
  ; 
  by 
  Frank 
  H. 
  Bigelow 
  253 
  

  

  Appendix. 
  — 
  XXVI. 
  — 
  Notice 
  of 
  New 
  Vertebrate 
  Fossils 
  ; 
  

  

  by 
  O. 
  C. 
  Marsh 
  _ 
  _ 
  _ 
  _ 
  _ 
  . 
  . 
  265 
  

  

  SCIENTIFIC 
  INTELLIGENCE. 
  

  

  Chemistry 
  — 
  Boron 
  tri-iodide, 
  Moissan, 
  256. 
  — 
  Hydrazine 
  hydrate 
  and 
  the 
  com- 
  

   pounds 
  of 
  Diammonium 
  with 
  the 
  Halogens, 
  Curtius 
  and 
  Schulz: 
  Synthesis 
  of 
  

   Indigo-carmine, 
  Heymaxx. 
  257. 
  — 
  Lecons 
  sur 
  les 
  Metaux, 
  Ditte, 
  258. 
  

  

  Geology 
  and 
  Natural 
  History 
  — 
  Composition 
  of 
  the 
  Till 
  or 
  Bowlder-Clay, 
  W. 
  G* 
  

   Crosby: 
  Geology 
  of 
  the 
  Bocky 
  Mountain 
  Begion 
  in 
  Canada. 
  Dr. 
  G. 
  M. 
  Daw- 
  

   son: 
  Greenstone 
  Schist 
  areas 
  of 
  Michigan, 
  G. 
  H. 
  Williams, 
  259. 
  — 
  Some 
  Bo- 
  

   tanic 
  Gardens 
  in 
  the 
  Equatorial 
  Belt 
  and 
  in 
  the 
  South 
  Seas, 
  260. 
  

  

  Issued 
  August 
  17. 
  

  

  