﻿VI 
  CONTENTS. 
  

  

  Number 
  280. 
  

  

  Page 
  

  

  Art. 
  XV. 
  — 
  On 
  Ripples 
  and 
  Related 
  Sedimentary 
  Surface 
  

   Forms 
  and 
  their 
  Paleogeographic 
  Interpretation 
  (Part 
  

   II) 
  ; 
  by 
  W. 
  H. 
  Bucher 
  241 
  

  

  Art. 
  XVI. 
  — 
  The 
  Rounding 
  of 
  Grains 
  of 
  Sand 
  by 
  Solution; 
  

  

  by 
  J. 
  J. 
  Galloway 
  270 
  

  

  Art. 
  XVII. 
  — 
  Co-operation 
  in 
  Advanced 
  Geologic 
  Instruc- 
  

   tion 
  ; 
  by 
  H. 
  E. 
  Gregory 
  281 
  

  

  Art. 
  XVIII. 
  — 
  Anglesite 
  from 
  The 
  Coeur 
  d' 
  Alene 
  District, 
  

  

  Idaho 
  ; 
  by 
  E. 
  V. 
  Shannon 
  287 
  

  

  Art. 
  XIX. 
  — 
  The 
  Proper 
  Name 
  for 
  the 
  Fossil 
  Hydroid 
  

  

  Beatricea 
  ; 
  by 
  C. 
  Schuchert 
  293 
  

  

  SCIENTIFIC 
  INTELLIGENCE. 
  

  

  Chemistry 
  and 
  Physics 
  — 
  A 
  New 
  Physico-chemical 
  Method 
  for 
  the 
  Determina- 
  

   tion 
  of 
  Alkali 
  Carbonates 
  in 
  the 
  Presence 
  of 
  Free 
  Alkalies, 
  Dubrisay, 
  

   Tripier 
  and 
  Toqtiet, 
  296.— 
  Complexity 
  of 
  Liquid 
  Sulphur, 
  A. 
  M. 
  Kellas: 
  

   Beverages 
  and 
  their 
  Adulteration, 
  H. 
  W. 
  Wiley 
  : 
  Eapid 
  Methods 
  for 
  the 
  

   Chemical 
  Analysis 
  of 
  Special 
  Steels, 
  Steel-making 
  Alloys 
  and 
  Graphite, 
  

   C. 
  M. 
  Johnson, 
  297. 
  — 
  A 
  Practice 
  Book 
  in 
  Elementary 
  Metallurgy, 
  E. 
  E. 
  

   Thum, 
  298.— 
  The 
  Thermal 
  Conductivity 
  of 
  Air, 
  E. 
  0. 
  Hercus 
  and 
  T. 
  H. 
  

   Laby, 
  299.— 
  Absorption 
  of 
  X-Eays, 
  E. 
  A. 
  Owen, 
  301.— 
  The 
  Nature 
  of 
  

   Sun-Spots, 
  G. 
  E. 
  Hale 
  : 
  Surface 
  Tension 
  and 
  Surface 
  Energy 
  and 
  their 
  

   influence 
  on 
  Chemical 
  Phenomena, 
  R. 
  S. 
  Willows 
  and 
  E. 
  Hatschek, 
  

   302. 
  

  

  Geology— 
  Lineas 
  generales 
  de 
  la 
  estratigrafia 
  del 
  Neocomiano 
  en 
  la 
  Cordillera 
  

   Argentina, 
  A. 
  Windhausen, 
  303. 
  — 
  The 
  Permo-Carboniferous 
  Ammonoids 
  

   of 
  the 
  Glass 
  Mountains, 
  West 
  Texas, 
  and 
  their 
  Stratigraphical 
  Significance, 
  

   E. 
  Bose, 
  305. 
  — 
  Lower 
  Cretaceous 
  Age 
  of 
  the 
  limestones 
  underlying 
  Florida, 
  

   J. 
  A. 
  Cushman 
  : 
  A 
  fossil 
  Isopod 
  belonging 
  to 
  the 
  freshwater 
  genus 
  Phrea- 
  

   toicus, 
  C. 
  Chilton 
  : 
  Triassic 
  of 
  Australia, 
  307. 
  — 
  Notes 
  on 
  the 
  Geology 
  of 
  

   Rhode 
  Island 
  (correction), 
  A. 
  C. 
  Hawkins, 
  308. 
  

  

  Miscellaneous 
  Scientific 
  Intelligence 
  — 
  National 
  Academy 
  of 
  Sciences, 
  308. 
  — 
  The 
  

   Elements 
  of 
  Animal 
  Biology, 
  S. 
  J. 
  Holmes 
  : 
  Tables 
  and 
  other 
  Data 
  

   for 
  Engineers 
  and 
  Business 
  Men, 
  C. 
  D. 
  Ferris 
  : 
  Annual 
  Report 
  of 
  the 
  

   Superintendent, 
  United 
  States 
  Coast 
  and 
  Geodetic 
  Survey: 
  De 
  Wijsbegeerte 
  

   de 
  Wiskunde 
  van 
  theistisch 
  Standpunt, 
  H. 
  T. 
  Vollenhoven, 
  309. 
  — 
  A 
  

   Century 
  of 
  Science 
  in 
  America 
  (correction) 
  : 
  All- 
  American 
  Time, 
  J. 
  G. 
  

   Porter, 
  310. 
  

  

  