﻿CONTENTS. 
  

  

  Laws 
  of 
  the 
  Society 
  relating 
  to 
  the 
  Transactions. 
  - 
  - 
  - 
  iii 
  

  

  Officers 
  of 
  the 
  Society 
  for 
  the 
  Year 
  1837. 
  ------- 
  v 
  

  

  List 
  of 
  the 
  Members 
  of 
  the 
  Society 
  elected 
  since 
  the 
  Publication 
  of 
  the 
  Fourth 
  Vo- 
  

   lume, 
  New 
  Series. 
  .._...-- 
  vii 
  

  

  Obituary 
  Notice. 
  - 
  - 
  - 
  . 
  - 
  - 
  - 
  - 
  - 
  ix 
  

  

  ARTICLE 
  I. 
  

  

  On 
  the 
  Diurnal 
  Variation 
  of 
  the 
  Horizontal 
  Needle. 
  By 
  Alexander 
  Dallas 
  Bache, 
  

   Professor 
  of 
  Natural 
  Philosophy 
  and 
  Chemistry 
  in 
  the 
  University 
  of 
  Pennsylva- 
  

   nia. 
  -...---.-- 
  

  

  ARTICLE 
  II. 
  

  

  Observations 
  on 
  the 
  Naiades 
  ; 
  and 
  Descriptions 
  of 
  New 
  Species 
  of 
  that, 
  and 
  other 
  

  

  Families. 
  By 
  Isaac 
  Lea. 
  ....... 
  23 
  

  

  ARTICLE 
  III. 
  

  

  On 
  the 
  Visceral 
  Anatomy 
  of 
  the 
  Python 
  (Cuvier), 
  described 
  by 
  Daudin 
  as 
  the 
  Boa 
  

  

  Reticulata. 
  By 
  J. 
  P. 
  Hopkinson, 
  M. 
  D. 
  and 
  J. 
  Pancoast, 
  M. 
  D. 
  - 
  - 
  121 
  

  

  ARTICLE 
  IV. 
  

  

  On 
  the 
  Longitude 
  of 
  the 
  Hall 
  of 
  the 
  American 
  Philosophical 
  Society, 
  deduced 
  from 
  

  

  an 
  Occultation 
  of 
  Aldebaran 
  observed 
  by 
  S. 
  C. 
  Walker 
  January 
  5th 
  1830. 
  - 
  135 
  

  

  