﻿and 
  Chemical 
  Reactioni< 
  in 
  Heterogeneous 
  Systems. 
  561 
  

  

  results 
  are 
  obtained 
  with 
  very 
  much 
  better 
  methods. 
  On 
  

   page 
  Gl 
  they 
  give 
  us 
  

  

  ?z 
  = 
  200 
  rey. 
  and 
  A 
  = 
  2-63 
  ; 
  ?i 
  = 
  177 
  rey. 
  and 
  A 
  = 
  2-7G, 
  

  

  i. 
  e. 
  a 
  diniimition 
  of 
  A 
  ^vith 
  the 
  increase 
  of 
  the 
  speed, 
  showing 
  

   the 
  hick 
  ot 
  sensitiyeness 
  of 
  their 
  method. 
  On 
  page 
  72 
  they 
  

   giye 
  us 
  the 
  variation 
  of 
  A 
  for 
  their 
  so-called 
  " 
  Magnesium 
  

   hydroxide 
  " 
  in 
  benzoic 
  acid 
  : 
  — 
  

  

  n 
  =135 
  ; 
  A 
  =1-35, 
  1-88, 
  l-76=ayer. 
  1*66. 
  

  

  771=182; 
  Ai 
  = 
  2-14, 
  1-71, 
  1*90, 
  1-87, 
  l-89 
  = 
  ayer. 
  1-92. 
  

  

  ?7o 
  = 
  178; 
  A2 
  = 
  2-14, 
  2-08 
  = 
  ayer. 
  2-11. 
  

  

  If 
  we 
  take 
  the 
  yelocitj 
  constant 
  to 
  be 
  directly 
  proportional 
  

   to 
  the 
  speed 
  of 
  the 
  stirrer, 
  we 
  get 
  — 
  

  

  ??i 
  182 
  , 
  ...^ 
  , 
  Ai 
  192 
  , 
  ,.- 
  

   — 
  = 
  — 
  7^ 
  = 
  1-348 
  and 
  V 
  = 
  ~r^ 
  = 
  l'lo7, 
  

   n 
  13o 
  A 
  Ibb 
  ^ 
  

  

  I. 
  e.^ 
  a 
  difference 
  of 
  14*2 
  per 
  cent. 
  

  

  ??2 
  178 
  1 
  QIC. 
  ] 
  -^2 
  211 
  1 
  O-'O 
  

  

  -- 
  = 
  Yrp- 
  = 
  l-31b 
  and 
  Y 
  = 
  T7r=l-'2^ 
  

   n 
  13o 
  A 
  Ibb 
  

  

  I. 
  e., 
  a 
  difference 
  of 
  3*5 
  per 
  cent. 
  

  

  If 
  we 
  take, 
  with 
  Xernst 
  and 
  Brunner, 
  the 
  yelocity 
  constant 
  

   to 
  be 
  directly 
  proportional 
  to 
  the 
  two-third 
  power 
  of 
  the 
  

   speed 
  of 
  the 
  stirrer 
  we 
  get 
  : 
  

  

  Ig 
  192-lo-lGC) 
  ,., 
  . 
  ■ 
  . 
  , 
  ... 
  

   ^- 
  ,^ 
  , 
  — 
  p-^rw^ 
  =^'±bi 
  msteatl 
  or 
  •()b 
  < 
  , 
  

   Ig 
  112— 
  ig 
  13o 
  

  

  i.e.^ 
  a 
  difference 
  of 
  —26*98 
  per 
  cent. 
  ; 
  and 
  

  

  Ig211-lgl66 
  ,,_^, 
  . 
  , 
  , 
  ^ 
  r^.^ 
  

   -.~^r-~ 
  — 
  1 
  -,.)- 
  =*bb/b 
  mstead 
  ot 
  'bb^, 
  

   Ig 
  l<«-lg 
  13o 
  

  

  i. 
  e., 
  a 
  difference 
  of 
  +30'08 
  per 
  cent. 
  

  

  Thus 
  Nernst 
  and 
  Brunner's 
  data, 
  if 
  anything, 
  proye 
  more 
  

   direct 
  proportionality 
  and 
  not 
  the 
  two-third 
  power 
  of 
  n, 
  and 
  

   in 
  reality 
  they 
  can 
  neither 
  be 
  used 
  for 
  the 
  proof 
  of 
  one 
  nor 
  

   for 
  the 
  proof 
  of 
  the 
  other, 
  especially 
  considering 
  the 
  fact 
  

   that 
  besides 
  general 
  great 
  experimental 
  errors 
  of 
  their 
  method 
  

   their 
  '' 
  Magnesium 
  hydroxide 
  '' 
  ])royes 
  also 
  to 
  haye 
  been 
  a 
  

   mixture 
  of 
  MgO, 
  Mg(0H)2, 
  MgCOg, 
  &c., 
  &c. 
  

  

  1 
  now 
  giye 
  here 
  a 
  careful 
  inyestigation 
  of 
  this 
  point 
  

   carried 
  out 
  with 
  speeds 
  from 
  about 
  2 
  to 
  400 
  reyolutions 
  per 
  

   minute 
  and 
  more. 
  (See 
  Table 
  11. 
  and 
  diagram 
  2.) 
  

  

  