﻿554 
  Dr. 
  Meyer 
  Wilderman 
  07i 
  Velocity 
  of 
  Molecular 
  

  

  constant 
  and 
  can 
  be 
  tested 
  in 
  an 
  independent 
  manner, 
  while 
  

   h 
  presents 
  no 
  such 
  embarrassing 
  feature, 
  as 
  it 
  cannot 
  he 
  

   tested 
  in 
  any 
  independent 
  ivay. 
  It 
  will 
  be 
  shown 
  later 
  on 
  

   that 
  the 
  apparent 
  proof 
  of 
  " 
  h 
  " 
  consisting 
  in 
  the 
  would-be 
  

   fact, 
  according 
  to 
  Nernst 
  and 
  Brunner, 
  that 
  the 
  speed 
  of 
  

   solution 
  of 
  magnesium 
  hydroxide, 
  magnesium 
  metal 
  in 
  benzoic 
  

   acid, 
  is 
  the 
  same 
  as 
  the 
  speed 
  of 
  solution 
  of 
  benzoic 
  acid 
  itself, 
  

   does 
  not 
  exist 
  and 
  is 
  based 
  only 
  upon 
  quite 
  arbitrary 
  experi- 
  

   ments. 
  About 
  this 
  8 
  we 
  read 
  : 
  — 
  " 
  This 
  B 
  should 
  depend 
  only 
  

   upon 
  speed 
  of 
  stirring 
  and 
  temperature 
  and 
  not 
  upon 
  the 
  

   nature 
  of 
  the 
  substance 
  in 
  solution;" 
  but 
  a 
  little 
  further 
  again 
  

   " 
  this, 
  however, 
  is 
  not 
  the 
  case, 
  because 
  this 
  layer 
  has 
  a 
  

   resting 
  surface 
  on 
  one 
  side 
  and 
  moving 
  on 
  the 
  other, 
  and 
  the 
  

   effect 
  of 
  the 
  last 
  becomes 
  the 
  greater 
  the 
  more 
  we 
  are 
  removed 
  

   in 
  this 
  layer 
  from 
  the 
  resting 
  surface," 
  '^ 
  nor 
  is 
  it 
  independent 
  

   of 
  the 
  value 
  F 
  itself 
  " 
  {i. 
  e. 
  it 
  depends 
  upon 
  the 
  nature 
  of 
  the 
  

   substance), 
  " 
  nor 
  is 
  it 
  the 
  same 
  at 
  all 
  places 
  of 
  the 
  surface 
  of 
  

   the 
  solid/' 
  and 
  lastly, 
  " 
  whether 
  8 
  depends 
  only 
  upon 
  tem- 
  

   perature 
  and 
  speed 
  of 
  stirring 
  it 
  is 
  difficult 
  to 
  say 
  in 
  advance/'^ 
  

   In 
  short 
  we 
  know 
  absolutely 
  nothing 
  about 
  this 
  very 
  8, 
  about 
  

   ivhich 
  we 
  ought 
  to 
  know 
  everything 
  and 
  upon 
  the 
  value 
  and 
  

   existence 
  of 
  lohich 
  the 
  whole 
  theory 
  depends. 
  

  

  It 
  is 
  quite 
  evident 
  that 
  until 
  some 
  independent 
  way 
  be 
  used 
  

   to 
  determine 
  the 
  value 
  8 
  in 
  each 
  case, 
  so 
  as 
  to 
  show 
  that 
  

   my 
  velocity-constant 
  A 
  is, 
  in 
  each 
  case, 
  really 
  composed 
  of 
  the 
  

   two 
  known 
  values 
  F 
  and 
  S, 
  not 
  an 
  atom 
  of 
  evidence 
  can 
  be 
  

   brought 
  for 
  the 
  existence 
  of 
  such 
  a 
  relationship. 
  All 
  Nernst 
  

   and 
  Brunner 
  do 
  is 
  to 
  divide 
  F 
  by 
  my 
  constant 
  A, 
  so 
  as 
  to 
  get 
  the 
  

  

  Tjl 
  

  

  value 
  which 
  8 
  ought 
  to 
  have, 
  in 
  order 
  that 
  -k- 
  shoidd 
  be 
  equal 
  

  

  to 
  A 
  which 
  is 
  found 
  in 
  the 
  experiment, 
  as 
  required 
  by 
  

   their 
  theory, 
  while 
  what 
  we 
  wish 
  to 
  know, 
  require 
  to 
  know, 
  

   is, 
  does 
  B 
  really 
  possess 
  such 
  a 
  value, 
  and 
  does 
  it 
  exist 
  

   at 
  all 
  ? 
  

  

  I 
  now 
  give 
  here 
  a 
  very 
  careful 
  investigation 
  of 
  the 
  influence 
  

   of 
  temperature 
  upon 
  the 
  velocity-constant, 
  carried 
  through 
  

   with 
  the 
  same 
  benzoic 
  acid 
  which 
  Nernst 
  and 
  Brunner 
  

   investigated, 
  and 
  for 
  a 
  series 
  of 
  temperatures 
  between 
  1° 
  C. 
  

   and 
  60° 
  C. 
  

  

  