﻿INCLUSIONS 
  IN 
  GRANITES. 
  

  

  217 
  

  

  Lane, 
  City. 
  These 
  appear 
  to 
  afford 
  direct 
  evidence 
  that 
  the 
  formation 
  

   of 
  the 
  inclusions 
  and 
  the 
  solidification 
  of 
  the 
  enclosing 
  granite 
  were 
  

   contemporaneous. 
  

  

  Inclusions 
  in 
  Shap 
  granite 
  : 
  a, 
  crystals 
  of 
  felspar. 
  

  

  Discussion. 
  

  

  Prof. 
  Bonnet 
  expressed 
  his 
  sense 
  of 
  the 
  value 
  of 
  Mr. 
  Phillips's 
  

   communication, 
  which 
  seemed 
  to 
  illustrate 
  the 
  order 
  of 
  solidification 
  

   of 
  the 
  constituents. 
  He 
  said 
  that 
  in 
  the 
  case 
  of 
  the 
  Shapfell 
  granite 
  

   the 
  felspar 
  crystals 
  appeared 
  to 
  have 
  been 
  developed 
  in 
  situ. 
  

  

  Mr. 
  Etheridge 
  remarked 
  upon 
  some 
  small 
  felspathic 
  veins 
  which 
  

   traversed 
  the 
  inclusion, 
  and 
  asked 
  if 
  they 
  were 
  contemporaneous. 
  

  

  Eev. 
  E. 
  Hill 
  asked 
  what 
  the 
  signification 
  might 
  he 
  of 
  the 
  rounding 
  

   of 
  the 
  felspar 
  crystals 
  described 
  by 
  the 
  author. 
  

  

  Mr. 
  Phillips 
  said 
  it 
  was 
  difficult 
  to 
  account 
  for 
  the 
  rounded 
  form 
  

   of 
  crystals 
  in 
  certain 
  rocks 
  ; 
  they 
  often 
  looked 
  as 
  if 
  they 
  had 
  

   crystallized 
  under 
  restraint. 
  In 
  the 
  present 
  case, 
  whatever 
  had 
  

   caused 
  the 
  segregation 
  of 
  the 
  mica 
  seemed 
  to 
  have 
  interfered 
  with 
  

   the 
  perfect 
  formation 
  of 
  the 
  felspar 
  crystals 
  — 
  which, 
  after 
  all, 
  was 
  

   not 
  a 
  very 
  satisfactory 
  explanation. 
  

  

  q2 
  

  

  