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  CONTENTS 
  

   Original 
  Papers 
  

  

  Page 
  

  

  Geophysics. 
  — 
  A 
  plea 
  for 
  geophysical 
  and 
  geochemical 
  observatories. 
  T. 
  A. 
  Jaggar. 
  "343 
  

  

  Paleontology. 
  — 
  Two 
  new 
  aphids 
  from 
  Baltic 
  amber. 
  A. 
  C. 
  Baker 
  " 
  353 
  

  

  Geology. 
  — 
  The 
  Lower 
  Paleozoic 
  section 
  of 
  southeastern 
  Pennsylvania. 
  George 
  W. 
  

  

  Stose 
  and 
  Anna 
  I. 
  Jonas 
  358 
  

  

  Scientific 
  Notes 
  and 
  News 
  366 
  

  

  OFFICERS 
  OF 
  THE 
  ACADEMY 
  

   President: 
  W. 
  J- 
  Humphreys, 
  Weather 
  Bureau. 
  

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

   Recording 
  Secretary: 
  Wii^liam 
  R. 
  Maxon, 
  National 
  Museum. 
  

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

  

  