﻿166 
  

  

  C. 
  Bar 
  us 
  — 
  Hot 
  Water 
  and 
  Soft 
  Glass 
  

  

  ing. 
  Black 
  stalactites, 
  however, 
  were 
  seen 
  in 
  the 
  tube 
  and 
  the 
  

   edges 
  were 
  every 
  where 
  rounded, 
  indicating 
  fusion. 
  The 
  result 
  

   of 
  the 
  experiment 
  was 
  a 
  thorough 
  dissociation 
  of 
  the 
  charge, 
  

   giving 
  impure 
  water 
  and 
  an 
  insoluble 
  residue 
  of 
  silicate. 
  This 
  

   mass 
  was 
  again 
  pulverized, 
  charged 
  into 
  the 
  retort 
  and 
  heated 
  

  

  for 
  five 
  hours. 
  On 
  opening 
  

   the 
  cold 
  retort 
  about 
  100 
  cub 
  cm 
  

   of 
  black 
  soapy 
  water 
  were 
  

   removed 
  ; 
  the 
  glass 
  remained 
  

   black 
  and 
  non-coherent. 
  Ex- 
  

   cess 
  of 
  water 
  does 
  not, 
  there- 
  

   fore, 
  favor 
  the 
  present 
  reac- 
  

   tions. 
  

  

  5. 
  With 
  these 
  definite 
  results 
  

   in 
  hand, 
  we 
  may 
  next 
  en- 
  

   deavor 
  to 
  inquire 
  into 
  the 
  

   quantitative 
  nature 
  of 
  the 
  pres- 
  

   ent 
  phenomena. 
  Having 
  this 
  

   end 
  in 
  view 
  I 
  returned 
  to 
  the 
  

   experiments 
  described 
  in 
  this 
  

   Journal 
  (vol. 
  xli, 
  1891) 
  some 
  

   years 
  ago 
  with 
  the 
  new 
  results 
  

   incorporated 
  in 
  the 
  present 
  

   summary. 
  To 
  make 
  the 
  ac- 
  

   count 
  intelligible 
  it 
  will 
  be 
  

   expedient 
  to 
  give 
  a 
  sketch 
  of 
  

   the 
  apparatus 
  used, 
  the 
  essen- 
  

   tials 
  of 
  which 
  are 
  shown 
  in 
  

   fig. 
  3. 
  Here 
  ah 
  is 
  the 
  capil- 
  

   lary 
  tube, 
  to 
  be 
  cemented 
  

   below 
  T 
  into 
  the 
  steel 
  flange 
  for 
  

   insertion 
  in 
  the 
  compression 
  

   pump. 
  The 
  capillary 
  tube 
  

   contains 
  a 
  thread 
  of 
  water 
  $6 
  T/ 
  

   (lines 
  of 
  sight 
  of 
  an 
  external 
  

   cathetometer), 
  between 
  visible 
  

   threads 
  of 
  mercury 
  m, 
  J/, 
  of 
  

   which 
  the 
  upper 
  one 
  is 
  sealed 
  

   in 
  position 
  by 
  a 
  terminal 
  

   thread 
  p, 
  of 
  solid 
  paraffine, 
  

   kept 
  cold 
  by 
  the 
  jacket 
  of 
  cir- 
  

   culating 
  water, 
  G. 
  The 
  lower 
  

   mercury 
  thread, 
  M, 
  transmits 
  

   the 
  pressure 
  of 
  the 
  force 
  pump 
  to 
  the 
  water, 
  which 
  is 
  thus 
  

   made 
  to 
  react 
  on 
  the 
  inner 
  wall 
  of 
  the 
  capillary 
  tube 
  at 
  a 
  defi- 
  

   nite 
  pressure 
  and 
  temperature. 
  The 
  latter 
  is 
  secured 
  by 
  a 
  

   boiling 
  tube 
  EE, 
  of 
  clear 
  glass, 
  of 
  the 
  kind 
  frequently 
  described 
  

  

  