﻿CONTENTS 
  TO 
  VOLUME 
  XLIX. 
  

  

  Number 
  289. 
  

  

  Page 
  

   Art. 
  I. 
  — 
  Paleogeography 
  and 
  Diastrophism 
  in 
  the 
  Atlantic- 
  

   Arctic 
  Region 
  during 
  Paleozoic 
  Time; 
  by 
  O. 
  Holtedahl 
  1 
  

  

  Art. 
  II. 
  — 
  The 
  Generic 
  Relations 
  of 
  the 
  American 
  Ordovician 
  

  

  Lichadidse; 
  by 
  A. 
  F. 
  Foerste. 
  (With 
  Plates 
  I 
  to 
  IV) 
  26 
  

  

  Art. 
  III. 
  — 
  On 
  Ammonoids 
  from 
  the 
  Abo 
  Sandstone 
  of 
  New 
  

   Mexico 
  and 
  the 
  Age 
  of 
  the 
  Beds 
  which 
  contain 
  them; 
  by 
  

   Dr. 
  E. 
  B6se 
  51 
  

  

  Art. 
  IV. 
  — 
  The 
  Origin 
  of 
  the 
  Dighton 
  Conglomerate 
  of 
  the 
  

   Narragansett 
  Basin 
  of 
  Massachusetts, 
  and 
  Rhode 
  Island; 
  

   by 
  Edward 
  H. 
  Perkins 
  61 
  

  

  Art. 
  V. 
  — 
  Sulphohalite 
  from 
  Searles 
  Lake, 
  California; 
  by 
  W. 
  

  

  Foshag 
  .' 
  76 
  

  

  SCIENTIFIC 
  INTELLIGENCE. 
  

  

  Chemistry 
  and 
  Physics 
  — 
  The 
  Application 
  of 
  Rotating 
  Reductors 
  in 
  the 
  Deter- 
  

   mination 
  of 
  Iron, 
  W. 
  Scott, 
  77. 
  — 
  Solubilities 
  of 
  Inorganic 
  and 
  Organic 
  

   Compounds, 
  A. 
  Seidell 
  : 
  The 
  Metals 
  of 
  the 
  Rare 
  Earths, 
  J. 
  F. 
  Spencer 
  : 
  

   The 
  Analysis 
  of 
  Silicate 
  and 
  Carbonate 
  Rocks, 
  W. 
  F. 
  Hillebrand: 
  Report 
  

   of 
  the 
  International 
  Committee 
  on 
  Atomic 
  Weights 
  for 
  1919-20, 
  F. 
  W. 
  

   Clarke, 
  etc., 
  78. 
  — 
  James 
  Cutbush, 
  an 
  American 
  Chemist 
  (L788-1823), 
  E. 
  

   F. 
  Smith 
  : 
  Sensibility 
  of 
  X-ray 
  Analysis 
  and 
  the 
  Absorption 
  Spectrum 
  of 
  

   Radium, 
  M. 
  de 
  Brogue, 
  79. 
  — 
  The 
  Spectra 
  of 
  lsotopis, 
  T. 
  R. 
  Merton, 
  

   80. 
  — 
  Helium 
  Series 
  in 
  the 
  Extreme 
  Ultra- 
  Violet, 
  T. 
  Lyman: 
  The 
  Realities 
  

   of 
  Modern 
  Science, 
  J. 
  Mills, 
  81. 
  

  

  Geology 
  and 
  Natural 
  History 
  — 
  Contributions 
  to 
  the 
  Geology 
  and 
  Paleontology 
  

   of 
  the 
  West 
  Indies, 
  T. 
  W. 
  Vacghan, 
  etc., 
  82. 
  — 
  Fossil 
  Bryozoa 
  from 
  the 
  

   West 
  Indies, 
  F. 
  Canu 
  and 
  R. 
  S. 
  Bassler": 
  The 
  Silurian 
  Geology 
  and 
  

   Faunas 
  of 
  Ontario 
  Peninsula, 
  and 
  Manitoulin 
  and 
  adjacent 
  Islands, 
  M. 
  Y. 
  

   Williams 
  : 
  Geology 
  of 
  the 
  Disturbed 
  Belt 
  of 
  southwestern 
  Alberta, 
  J. 
  S. 
  

   Stewart 
  : 
  New 
  Species 
  of 
  Pelecypods 
  from 
  the 
  Cretaceous 
  of 
  Northern 
  

   Alberta, 
  F. 
  H. 
  McLearn, 
  83. 
  — 
  The 
  Discovery 
  of 
  a 
  Portage 
  Fauna 
  in 
  the 
  

   Mackenzie 
  River 
  Valley, 
  E. 
  M. 
  Kindle 
  : 
  On 
  a 
  new 
  Exogyra 
  from 
  the 
  Del 
  

   Rio 
  Clay 
  and 
  some 
  Observations 
  on 
  the 
  Evolution 
  of 
  Exogyra 
  in 
  the 
  Texas 
  

   Cretaceous, 
  E. 
  B6se 
  : 
  Present 
  Tendencies 
  in 
  Geology 
  : 
  Sedimentation, 
  

   E. 
  W. 
  Shaw 
  : 
  Manual 
  of 
  Suggestions 
  for 
  Teachers, 
  to 
  accompany 
  Elemen- 
  

   tary 
  Biology, 
  B. 
  C. 
  Gruenberg 
  : 
  A 
  Laboratory 
  Manual 
  for 
  Elementary 
  

   Zoology, 
  L. 
  H. 
  Hyman, 
  84. 
  

  

  Miscellaneous 
  Scientific 
  Intelligence 
  — 
  The 
  Jubilee 
  Number 
  of 
  Nature, 
  85. 
  — 
  Geo- 
  

   grafiska 
  Annaler 
  : 
  The 
  American 
  Association 
  for 
  the 
  Advancement 
  of 
  

   Science 
  : 
  The 
  French 
  Academy 
  of 
  Sciences 
  : 
  The 
  Story 
  of 
  Milk, 
  D. 
  Fred- 
  

   eriksen, 
  86. 
  

  

  Obituary— 
  L. 
  V. 
  Pirsson 
  : 
  J. 
  Aiken. 
  86. 
  

  

  