﻿386 
  

  

  Prof. 
  McLennan 
  and 
  Mr. 
  Kennedy 
  on 
  the 
  

  

  obtained 
  from 
  one 
  manufacturer, 
  one 
  from 
  a 
  second, 
  and 
  also 
  

   one 
  from 
  a 
  third 
  manufacturer. 
  

  

  The 
  activities 
  of 
  these 
  salts 
  were 
  examined 
  in 
  the 
  manner 
  

   indicated 
  above, 
  and 
  the 
  salts 
  themselves 
  have 
  since 
  been 
  

   analysed 
  by 
  Professor 
  A. 
  B. 
  Macallum, 
  who 
  has 
  very 
  kindly 
  

   determined 
  the 
  potassium 
  content 
  of 
  each 
  of 
  them 
  for 
  us, 
  

   using 
  the 
  platinum 
  method. 
  

  

  The 
  results 
  of 
  this 
  examination 
  are 
  recorded 
  in 
  Table 
  VI., 
  

   the 
  relative 
  activities 
  being 
  given 
  in 
  Column 
  I. 
  of 
  this 
  table. 
  

   In 
  making 
  the 
  analyses, 
  equal 
  weights 
  of 
  the 
  different 
  salts 
  

   were 
  taken 
  and 
  the 
  potassium 
  present 
  in 
  each 
  sample 
  of 
  the 
  

   salt 
  determined 
  as 
  a 
  percentage 
  of 
  the 
  total 
  weight. 
  These 
  

   percentages 
  are 
  recorded 
  in 
  Column 
  II. 
  of 
  Table 
  VI. 
  

  

  Table 
  VI. 
  

   Activities 
  of 
  different 
  samples 
  of 
  Potassium 
  Cyanide. 
  

  

  Source 
  of 
  Salt. 
  

  

  Column 
  I. 
  

  

  Column 
  II. 
  

  

  Eelative 
  Activities 
  

   of 
  Salts. 
  

  

  Percentage 
  by 
  

  

  weight 
  of 
  Potassium 
  

  

  present 
  in 
  Salts. 
  

  

  Manufacturer 
  "A" 
  Sample 
  No. 
  1. 
  

   Manufacturer 
  " 
  B 
  " 
  Sample 
  No. 
  1. 
  

   Manufacturer 
  "C" 
  Sample 
  No. 
  1. 
  

  

  ., 
  No. 
  2. 
  

  

  „ 
  No. 
  3. 
  

  

  ,, 
  No. 
  4. 
  

   „ 
  „ 
  No. 
  5. 
  

  

  8-85 
  

   1-40 
  

  

  •15 
  

  

  •10 
  

  

  •60 
  

  

  •00 
  (slight) 
  

   1-47 
  

  

  52-15 
  

   9-44 
  

   2-84 
  

   2-76 
  

   9-57 
  

   2-36 
  

   7-64 
  

  

  In 
  arriving 
  at 
  these 
  results 
  the 
  different 
  salts 
  were 
  placed 
  

   in 
  bottles 
  and 
  sealed 
  immediately 
  after 
  their 
  activities 
  were 
  

   ascertained. 
  They 
  were 
  also 
  kept 
  sealed 
  until 
  the 
  analyses 
  

   were 
  made. 
  This 
  precaution 
  was 
  taken 
  in 
  order 
  to 
  prevent 
  

   the 
  absorption 
  of 
  moisture 
  from 
  the 
  air, 
  as 
  otherwise, 
  since 
  

   the 
  salts 
  are 
  hygroscopic, 
  values 
  for 
  the 
  percentage 
  contents 
  

   of 
  potassium 
  in 
  the 
  salts 
  would 
  have 
  been 
  obtained 
  which 
  

   would 
  not 
  have 
  been 
  applicable 
  in 
  a 
  discussion 
  of 
  their 
  relative 
  

   activities 
  determined 
  some 
  time 
  previously. 
  

  

  From 
  the 
  results 
  set 
  forth 
  in 
  Table 
  VI. 
  it 
  will 
  be 
  seen 
  that 
  

   exceedingly 
  wide 
  variations 
  were 
  found 
  in 
  the 
  potassium 
  

   content 
  of 
  the 
  different 
  specimens. 
  It 
  will 
  be 
  seen, 
  too, 
  that 
  

   those 
  salts 
  which 
  possessed 
  the 
  greater 
  potassium 
  content 
  

   also 
  exhibited 
  the 
  higher 
  activities, 
  and 
  that 
  in 
  the 
  case 
  of 
  

  

  