﻿482 
  Transactions. 
  — 
  Chemistry. 
  

  

  them, 
  so 
  each 
  of 
  them 
  — 
  that 
  is, 
  the 
  oil 
  and 
  camphor 
  — 
  can 
  only 
  respond 
  to 
  

   their 
  affinities 
  for 
  water 
  ; 
  to 
  the 
  water 
  therefore 
  they 
  both 
  keep, 
  for 
  its 
  

   possession 
  they 
  fight. 
  It 
  is 
  a 
  running 
  fight, 
  in 
  which 
  the 
  oil 
  having 
  a 
  

   motion 
  of 
  its 
  own 
  communicates 
  a 
  part 
  of 
  this 
  to 
  the 
  camphor, 
  and 
  so 
  

   appears 
  as 
  the 
  pursuer. 
  

  

  Summarizing, 
  now, 
  all 
  that 
  we 
  have 
  here 
  arrived 
  at, 
  by 
  way 
  of 
  

   emphasizing 
  the 
  points 
  I 
  consider 
  as 
  fundamental 
  to 
  the 
  theory 
  I 
  have 
  

   proposed, 
  you 
  perceive 
  that 
  I 
  have 
  maintained 
  upon 
  evidence, 
  much 
  of 
  which 
  

   has 
  been 
  experimentally 
  demonstrated, 
  that 
  the 
  movements 
  described 
  by 
  

   camphor 
  occupying 
  a 
  surface 
  of 
  pure 
  water,, 
  are 
  neither 
  due 
  to 
  the 
  direct 
  

   impingement 
  of 
  vapour 
  upon 
  such 
  surface, 
  nor 
  yet 
  to 
  any 
  electrical 
  effect, 
  

   but 
  to 
  the 
  production 
  of 
  a 
  compound 
  of 
  camphor 
  with 
  water, 
  which, 
  being 
  

   of 
  an 
  oily 
  nature, 
  spreads 
  upon 
  the 
  surface 
  of 
  the 
  water, 
  and, 
  in 
  the 
  act, 
  

   forces 
  the 
  camphor 
  to 
  describe 
  the 
  movements 
  in 
  question, 
  precisely 
  in 
  the 
  

   same 
  manner 
  that 
  oils 
  generally, 
  in 
  their 
  flow 
  along 
  the 
  same 
  kind 
  of 
  

   surface, 
  can 
  urge 
  away 
  from 
  them 
  any 
  sohd 
  particles 
  resident 
  thereon. 
  In 
  

   the 
  actual 
  process, 
  directly 
  that 
  the 
  camphor 
  touches 
  the 
  water 
  there 
  is 
  a 
  

   considerable 
  but 
  unequal 
  output 
  of 
  this 
  oil 
  therefrom, 
  and 
  as 
  this 
  does 
  not 
  

   dissolve 
  in 
  the 
  water, 
  nor 
  volatilize, 
  at 
  nearly 
  the 
  speed 
  at 
  which 
  it 
  is 
  

   formed, 
  it 
  spreads 
  principally 
  upon 
  the 
  water, 
  and 
  retaining 
  for 
  the 
  time 
  

   possession 
  of 
  all 
  it 
  thus 
  overruns, 
  it 
  urges 
  and 
  keeps 
  the 
  solid 
  camphor 
  

   away. 
  

  

  As 
  I 
  have 
  already 
  stated, 
  were 
  the 
  production 
  of 
  this 
  compound 
  equal 
  

   around 
  the 
  camphor, 
  we 
  should 
  not 
  see 
  the 
  camphor 
  move 
  as 
  we 
  have 
  done 
  ; 
  

   but 
  this 
  is 
  in 
  the 
  nature 
  of 
  things 
  impossible, 
  as 
  there 
  is 
  certain 
  to 
  be 
  more 
  

   of 
  it 
  made 
  at 
  the 
  instant 
  of 
  immersion 
  upon 
  one 
  side 
  of 
  the 
  camphor 
  than 
  

   upon 
  any 
  other 
  of 
  equal 
  extent, 
  and 
  so 
  an 
  initial 
  movement 
  and 
  direction 
  is 
  

   given 
  to 
  the 
  camphor. 
  When 
  this 
  direction 
  changes, 
  as 
  it 
  frequently 
  does, 
  

   the 
  output 
  of 
  oil 
  has 
  become 
  greater 
  upon 
  a 
  different 
  side, 
  or 
  the 
  cam- 
  

   phor, 
  in 
  its 
  course, 
  has 
  got 
  into 
  contact 
  with 
  its 
  trail 
  ; 
  when 
  aU 
  movement 
  

   ceases, 
  the 
  whole 
  surface 
  of 
  the 
  water, 
  or 
  at 
  least 
  that 
  within 
  a 
  considerable' 
  

   distance 
  of 
  the 
  camphor, 
  has 
  got 
  enfilmed 
  mth 
  the 
  oily 
  compound, 
  and 
  the 
  

   camphor 
  thus 
  becomes 
  oil-bound. 
  

  

  As 
  to 
  the 
  reason 
  why 
  the 
  oil 
  of 
  camphor 
  when 
  in 
  motion, 
  or, 
  indeed, 
  

   any 
  oil 
  in 
  motion, 
  should 
  thus 
  urge 
  camphor 
  about, 
  I 
  have 
  attempted 
  to 
  

   show 
  that 
  this 
  is 
  due 
  to 
  the 
  fact 
  that 
  they 
  have 
  no 
  affinity 
  for 
  each 
  other, 
  

   but 
  that 
  each 
  has 
  an 
  affinity 
  for 
  water, 
  and 
  so 
  they 
  have 
  both 
  a 
  tendency 
  to 
  

   keep 
  in 
  contact 
  with 
  it 
  — 
  in 
  fact, 
  they 
  are 
  adlaesive 
  in 
  relation 
  to 
  the 
  water, 
  

   but 
  neutral 
  in 
  regard 
  to 
  each 
  other, 
  hence 
  the 
  appearance 
  of 
  direct 
  repulsive 
  

   effect 
  — 
  a 
  kind 
  of 
  effect, 
  which 
  by^he-way^ 
  I 
  beUeve 
  to 
  be 
  always 
  due 
  to 
  

   secondary 
  action 
  < 
  

  

  