﻿CONTENTS. 
  

  

  Number 
  252. 
  

  

  Page 
  

  

  Art. 
  XLV1I. 
  — 
  Percival's 
  map 
  of 
  the 
  Jura-Trias 
  trap-belts 
  

   of 
  Central 
  Connecticut, 
  with 
  observations 
  on 
  the 
  up- 
  

   turning, 
  or 
  mountain-making 
  disturbance, 
  of 
  the 
  Forma- 
  

   tion 
  ; 
  by 
  J. 
  D. 
  Dana. 
  With 
  a 
  map, 
  Plate 
  XVI 
  439 
  

  

  XLVIII. 
  — 
  The 
  Detection 
  and 
  Determination 
  of 
  Potassium 
  

  

  Spectroscopically 
  ; 
  by 
  F. 
  A. 
  Gooch 
  and 
  T. 
  S. 
  Hart___ 
  448 
  

  

  XLIX. 
  — 
  The 
  Ultra- 
  Violet 
  Spectrum 
  of 
  the 
  Solar 
  Promi- 
  

   nences; 
  by 
  G. 
  E. 
  Hale___ 
  459 
  

  

  L. 
  — 
  Phonics 
  of 
  Auditoriums 
  ; 
  by 
  E. 
  Cutter 
  468 
  

  

  LI. 
  — 
  The 
  Secular 
  Variation 
  of 
  Latitudes; 
  by 
  G. 
  C. 
  Comstock 
  470 
  

  

  LIL 
  — 
  Capture 
  of 
  Comets 
  by 
  Planets, 
  especially 
  their 
  Capture 
  

  

  by 
  Jupiter; 
  by 
  H. 
  A. 
  Newton 
  482 
  

  

  LIII. 
  — 
  Distribution 
  of 
  Titanic 
  Oxide 
  upon 
  the 
  surface 
  of 
  the 
  

  

  Earth; 
  by 
  F. 
  P. 
  Dunjsington 
  - 
  491 
  

  

  LIV. 
  — 
  Notes 
  on 
  a 
  Missouri 
  Barite 
  ; 
  by 
  C. 
  Lttedeking 
  and 
  

  

  H. 
  A. 
  Wheeler. 
  495 
  

  

  LV.— 
  The 
  Contraction 
  of 
  Molten 
  Rock; 
  by 
  C. 
  Barus 
  498 
  

  

  LVI. 
  — 
  Notes 
  on 
  Michigan 
  Minerals 
  ; 
  by 
  A. 
  C. 
  Lane, 
  H. 
  F. 
  

  

  Keller 
  and 
  F. 
  F. 
  Sharpless 
  499 
  

  

  SCIENTIFIC 
  INTELLIGENCE. 
  

  

  Chemistry 
  and 
  Physics 
  — 
  Two 
  new 
  Modifications 
  of 
  Sulphur, 
  Engel: 
  Chemistry 
  

   of 
  the 
  Carbon 
  compounds 
  or 
  Organic 
  Chemistry, 
  von 
  Richter, 
  509. 
  — 
  System 
  of 
  

   Inorganic 
  Chemistry, 
  ¥m, 
  Ramsay: 
  An 
  Introduction 
  to 
  the 
  Mathematical 
  The- 
  

   ory 
  of 
  Electricity 
  and 
  Magnetism, 
  W. 
  T. 
  H. 
  Emtage, 
  510. 
  — 
  Chapters 
  on 
  Elec- 
  

   tricity, 
  S. 
  Sheldon: 
  Apparent 
  change 
  in 
  electrochemical 
  equivalent 
  of 
  copper, 
  

   Vanni 
  : 
  Electrolytic 
  generation 
  of 
  Gas 
  in 
  a 
  closed 
  space, 
  Chabrt 
  : 
  Damping 
  of 
  

   electrical 
  oscillations, 
  JBjerknes 
  : 
  Velocity 
  of 
  Electrical 
  waves 
  in 
  solid 
  insulators, 
  

   Avons 
  and 
  Rubens, 
  511. 
  

  

  Geology 
  — 
  British 
  Earthquakes 
  of 
  1889, 
  C. 
  Davison, 
  512. 
  — 
  'Formation 
  of 
  Graphite 
  

   in 
  Contact-metamorphism, 
  Beck 
  and 
  Luzr, 
  514. 
  — 
  Geological 
  Survey 
  of 
  Alabama, 
  

   E. 
  A. 
  Smith: 
  Geological 
  Survey 
  of 
  Missouri, 
  Bulletin 
  No. 
  5, 
  A. 
  Winslow: 
  

   Geological 
  Survey 
  of 
  Georgia, 
  L. 
  W. 
  Spencer, 
  515. 
  — 
  Geological 
  facts 
  on 
  Grand 
  

   River, 
  Labrador, 
  A. 
  Cary: 
  Index 
  to 
  the 
  known 
  Fossil 
  Insects 
  of 
  the 
  World, 
  

   S. 
  H. 
  Scudder: 
  Stones 
  for 
  Building 
  and 
  Decoration, 
  G. 
  P. 
  Merrill: 
  Manga- 
  

   nese, 
  its 
  uses, 
  ores 
  and 
  deposits, 
  R. 
  A. 
  F. 
  Penrose, 
  Jr., 
  516. 
  

  

  Botany 
  — 
  Botanic 
  Gardens 
  in 
  the 
  Equatorial 
  Belt 
  and 
  in 
  the 
  South 
  Seas, 
  517. 
  

  

  Miscellaneous 
  Scientific 
  Intelligence 
  — 
  Analysis 
  of 
  the 
  water 
  of 
  the 
  Salt 
  Lake, 
  Alia- 
  

   paakai, 
  on 
  Oahu, 
  Hawaiian 
  Islands, 
  Prof. 
  Lyons. 
  522. 
  — 
  National 
  Academy 
  of 
  

   Sciences 
  : 
  The 
  Metal 
  Worker, 
  A. 
  0. 
  Kittredge, 
  523. 
  

  

  Obituary 
  — 
  J. 
  Francis 
  Williams. 
  

  

  