﻿XIV 
  CONTENTS. 
  

  

  • 
  ARTICLE 
  XVII. 
  

  

  Of 
  the 
  Reaction 
  of 
  the 
  Essential 
  Oils 
  with 
  Sulphurous 
  Acid, 
  as 
  evolved 
  in 
  Union 
  with 
  

   Ether 
  in 
  the 
  Process 
  of 
  E 
  Aerification, 
  or 
  otherwise. 
  By 
  R. 
  Hare, 
  M.D., 
  <fec, 
  

   &c, 
  <fcc. 
  ......... 
  355 
  

  

  ARTICLE 
  XVIII. 
  

  

  Of 
  Sassarubrin, 
  a 
  Resin 
  evolved 
  by 
  Sulphuric 
  Acid 
  from 
  Oil 
  of 
  Sassafras, 
  which 
  is 
  

   remarkable 
  for 
  its 
  efficacy 
  in 
  Reddening 
  that 
  Acid 
  in 
  its 
  concentrated 
  State. 
  By 
  R. 
  

   Hare, 
  M.D., 
  &c, 
  &c, 
  &c. 
  ....... 
  360 
  

  

  ARTICLE 
  XIX. 
  

  

  Process 
  for 
  Nitric 
  Ether, 
  or 
  Sweet 
  Spirits 
  of 
  Nitre, 
  by 
  means 
  of 
  an 
  approved 
  Appa- 
  

   ratus. 
  By 
  R. 
  Hare, 
  M.D., 
  <fcc, 
  &c, 
  <fec. 
  ..... 
  363 
  

  

  ARTICLE 
  XX. 
  

  

  Description 
  of 
  an 
  Electrical 
  Machine, 
  with 
  a 
  Plate 
  four 
  feet 
  in 
  Diameter, 
  so 
  construct- 
  

   ed 
  as 
  to 
  be 
  above 
  the 
  Operator 
  : 
  also 
  of 
  a 
  Battery 
  Discharger 
  employed 
  therewith 
  : 
  

   and 
  some 
  Observations 
  on 
  the 
  Causes 
  of 
  the 
  Diversity 
  in 
  the 
  Length 
  of 
  the 
  Sparks 
  

   erroneously 
  distinguished 
  by 
  the 
  terms 
  Positive 
  and 
  Negative. 
  By 
  R. 
  Hare, 
  M.D., 
  

   <fec, 
  &c, 
  <fec. 
  .....---- 
  365 
  

  

  ARTICLE 
  XXI. 
  

  

  On 
  the 
  Causes 
  of 
  the 
  Tornado, 
  or 
  Water 
  Spout. 
  By 
  R. 
  Hare, 
  M.D., 
  <fec, 
  <fec, 
  &c. 
  375 
  

  

  ARTICLE 
  XXII. 
  

  

  Description 
  of 
  an 
  Air 
  Pump 
  of 
  a 
  new 
  Construction, 
  which 
  acts 
  either 
  as 
  an 
  Air 
  Pump, 
  

   or 
  a 
  Condenser, 
  or 
  as 
  both 
  ; 
  enabling 
  the 
  operator 
  to 
  exhaust, 
  to 
  condense, 
  to 
  

   ransfer 
  a 
  Gas 
  from 
  one 
  cavity 
  to 
  another, 
  or 
  to 
  pass 
  it 
  through 
  a 
  Liquid. 
  By 
  R. 
  

   Hare, 
  M.D., 
  <fec, 
  <fcc, 
  &c. 
  - 
  - 
  - 
  - 
  - 
  - 
  - 
  385 
  

  

  