﻿Xll 
  CONTENTS. 
  

  

  ARTICLE 
  V. 
  

  

  On 
  the 
  Crystals 
  developed 
  in 
  Verraiculite 
  by 
  Heat. 
  By 
  Andres 
  Del 
  Rio, 
  Professor 
  

  

  of 
  Mineralogy 
  in 
  the 
  Mexican 
  School 
  of 
  Mines. 
  - 
  - 
  - 
  - 
  - 
  137 
  

  

  ARTICLE 
  VI. 
  

  

  Collections 
  towards 
  a 
  Flora 
  of 
  the 
  Territory 
  of 
  Arkansas. 
  By 
  Thomas 
  Nuttall. 
  - 
  139 
  

  

  ARTICLE 
  VII. 
  

  

  A 
  Remarkable 
  Arrangement 
  of 
  Numbers, 
  constituting 
  a 
  Magic 
  Cyclovolute. 
  By 
  E. 
  

  

  Nulty, 
  Philadelphia. 
  - 
  - 
  - 
  - 
  - 
  - 
  - 
  -205 
  

  

  ARTICLE 
  VIII. 
  

  

  Observations 
  to 
  determine 
  the 
  Magnetic 
  Dip 
  at 
  Baltimore, 
  Philadelphia, 
  New 
  York, 
  

   West 
  Point, 
  Providence, 
  Springfield 
  and 
  Albany. 
  By 
  A. 
  D. 
  Bache, 
  professor 
  of 
  

   Natural 
  Philosophy 
  and 
  Chemistry, 
  and 
  Edward 
  H. 
  Courteuay, 
  Professor 
  of 
  

   Mathematics, 
  in 
  the 
  University 
  of 
  Pennsylvania. 
  ----- 
  209 
  

  

  ARTICLE 
  IX. 
  

  

  Contributions 
  to 
  Electricity 
  and 
  Magnetism. 
  By 
  Joseph 
  Henry, 
  Professor 
  of 
  Natu- 
  

   ral 
  Philosophy 
  in 
  the 
  College 
  of 
  New 
  Jersey, 
  Princeton, 
  late 
  of 
  the 
  Albany 
  Acade- 
  

   my. 
  — 
  No. 
  I. 
  Description 
  of 
  a 
  Galvanic 
  Battery 
  for 
  producing 
  Electricity 
  of 
  differ- 
  

   ent 
  Intensities. 
  - 
  - 
  - 
  - 
  - 
  - 
  - 
  - 
  .21? 
  

  

  ARTICLE 
  X. 
  

  

  Contributions 
  to 
  Electricity 
  and 
  Magnetism. 
  By 
  Joseph 
  Henry, 
  Professor 
  of 
  Natural 
  

   Philosophy 
  in 
  the 
  College 
  of 
  New 
  Jersey, 
  Princeton, 
  late 
  of 
  the 
  Albany 
  Academy. 
  

   — 
  No. 
  II. 
  On 
  the 
  Influence 
  of 
  a 
  Spiral 
  Conductor 
  in 
  increasing 
  the 
  Intensity 
  of 
  

   Electricity 
  from 
  a 
  Galvanic 
  Arrangement 
  of 
  a 
  Single 
  Pair, 
  &c. 
  - 
  - 
  - 
  223 
  

  

  