﻿CONTENTS 
  

  

  Original 
  Papers 
  

  

  Page 
  

  

  Petrology. 
  — 
  The 
  development 
  of 
  pressure 
  in 
  magmas 
  as 
  a 
  result 
  of 
  crystallization 
  

  

  George 
  W. 
  Morey 
  219 
  

  

  PROCEEDINGS 
  

  

  Biological 
  Society 
  231 
  

  

  Botanical 
  Society 
  235 
  

  

  OFFICERS 
  OF 
  THE 
  ACADEMY 
  

   President: 
  W. 
  J. 
  Humphreys, 
  Weather 
  Bureau. 
  

   Corresponding 
  Secretary: 
  Francis 
  B. 
  Silsbee, 
  Bureau 
  of 
  Standards. 
  

   Recording 
  Secretary: 
  William 
  R. 
  Maxon, 
  National 
  Museum. 
  

   Treasurer: 
  R. 
  L. 
  Faris, 
  Coast 
  and 
  Geodetic 
  Survey. 
  

  

  