﻿VICTORIA 
  PARK, 
  WHITELNCH, 
  NEAR 
  GLASGOW. 
  631 
  

  

  interest 
  in 
  these 
  veins 
  consists 
  in 
  what 
  seems 
  to 
  be 
  the 
  reciprocal 
  

   action 
  of 
  synchronous 
  cooling 
  and 
  heating, 
  which, 
  if 
  the 
  foregoing 
  

   interpretation 
  of 
  the 
  microscopic 
  phenomena 
  be 
  correct, 
  must 
  have 
  

   taken 
  place 
  between 
  the 
  whin-vein 
  and 
  its 
  adjacent 
  walls 
  of 
  

   shale. 
  

  

  That 
  there 
  has 
  been 
  a 
  somewhat 
  rapid 
  chilling 
  of 
  the 
  whin 
  is 
  

   evident 
  from 
  the 
  production 
  of 
  its 
  once 
  vitreons 
  selvage, 
  and 
  it 
  

   would 
  appear 
  that 
  the 
  heat 
  needful 
  for 
  the 
  retention 
  of 
  the 
  whin 
  in 
  

   a 
  state 
  of 
  fusion 
  has 
  been 
  transferred 
  to 
  the 
  shale, 
  fusing 
  the 
  latter 
  

   to 
  a 
  slight 
  extent. 
  The 
  two 
  vitreous 
  bands 
  (b 
  and 
  c) 
  taken 
  together 
  

   seldom, 
  indeed, 
  attain 
  a 
  thickness 
  of 
  more 
  than 
  ^V 
  inch, 
  so 
  that 
  a 
  

   selvage 
  of 
  these 
  small 
  dimensions 
  might 
  easily 
  be 
  overlooked 
  in 
  the 
  

   field 
  by 
  any 
  but 
  most 
  careful 
  observers. 
  

  

  An 
  analysis 
  of 
  a 
  specimen 
  collected 
  by 
  Mr. 
  Young 
  from 
  one 
  of 
  

   these 
  narrow 
  veins 
  has 
  kindly 
  been 
  made 
  for 
  me 
  by 
  my 
  friend 
  

   Mr. 
  Philip 
  Holland. 
  The 
  specimen 
  showed 
  the 
  entire 
  thickness 
  of 
  

   the 
  whin-vein 
  itself, 
  after 
  the 
  removal 
  of 
  the 
  shale 
  with 
  its 
  adherent 
  

   shale-glass 
  selvage. 
  

  

  The 
  following 
  is 
  the 
  result 
  of 
  the 
  analysis 
  : 
  — 
  

  

  White-Whin 
  Vein, 
  about 
  one 
  inch 
  in 
  breadth, 
  Victoria 
  Park, 
  

   Whiteinch, 
  near 
  Glasgow. 
  Sp. 
  gr. 
  2*62. 
  

  

  Si0 
  2 
  

  

  = 
  

  

  45-240 
  

  

  A1 
  2 
  3 
  

  

  = 
  

  

  17-080 
  

  

  *V>. 
  

  

  = 
  

  

  1-841 
  

  

  FeO 
  

  

  s= 
  

  

  8-019 
  

  

  MnO 
  

  

  = 
  

  

  0-140 
  

  

  Ti0 
  2 
  

  

  = 
  

  

  2-400 
  

  

  CaO 
  

  

  = 
  

  

  4-640 
  

  

  MgO 
  

  

  = 
  

  

  5-744 
  

  

  K 
  2 
  

  

  = 
  

  

  0-127 
  

  

  Na 
  2 
  

  

  z= 
  

  

  5-315 
  

  

  PA 
  

  

  = 
  

  

  0-570 
  

  

  co 
  2 
  

  

  = 
  

  

  2-980 
  

  

  Combined 
  water 
  

  

  = 
  

  

  5-655 
  

  

  99-751 
  

  

  P. 
  Holland, 
  F.C.S., 
  F.I.C., 
  

  

  SoutJvport. 
  

  

  The 
  microscopic 
  examination, 
  coupled 
  with 
  the 
  chemical 
  analysis, 
  

   of 
  this 
  whin-vein 
  indicates 
  that 
  its 
  constituents 
  are 
  chiefly 
  plagio- 
  

   clastic 
  felspar 
  (? 
  labradorite), 
  serpentine 
  pseudomorphous 
  after 
  

   augite 
  and 
  olivine, 
  calcite 
  also 
  pseudomorphous 
  after 
  augite 
  and 
  

   olivine, 
  or 
  forming 
  amygdaloidal 
  bodies. 
  

  

  In 
  addition 
  to 
  these 
  minerals 
  there 
  appears 
  to 
  be 
  a 
  small 
  amount 
  

   of 
  garnet 
  (probably 
  spessartine 
  ?), 
  represented 
  by 
  minute 
  grains 
  

   and 
  occasionally 
  well-formed 
  crystals, 
  a 
  certain 
  amount 
  of 
  leu- 
  

   coxene, 
  resulting 
  from 
  the 
  alteration 
  of 
  ilmenite 
  and 
  titaniferous 
  

  

  