﻿Geological 
  Society. 
  935 
  

  

  4. 
  An 
  approximate 
  measurement 
  was 
  made 
  of 
  the 
  true 
  

   solubility 
  (as 
  distinguished 
  from 
  the 
  surface 
  condensation) 
  

   of 
  hydrogen 
  in 
  the 
  coconut 
  carbon. 
  At 
  the 
  temperature 
  of 
  

   liquid 
  air 
  it 
  varies 
  with 
  the 
  square 
  root 
  of 
  the 
  pressure. 
  

   Hence 
  hydrogen 
  dissolved 
  in 
  carbon 
  is 
  split 
  up 
  into 
  simple 
  

   atoms. 
  The 
  solubility 
  amounted 
  to 
  4 
  c.c. 
  (corr.) 
  hydrogen 
  

   per 
  gram 
  of 
  carbon 
  at 
  a 
  pressure 
  of 
  19 
  mm., 
  equivalent 
  to 
  

   one 
  seventh 
  of 
  the 
  total 
  gas 
  taken 
  up 
  by 
  the 
  carbon. 
  The 
  

   true 
  solubility 
  at 
  room 
  temperature 
  is 
  less 
  than 
  one 
  hundredth 
  

   as 
  great. 
  

  

  5. 
  Since 
  " 
  adsorption 
  " 
  in 
  the 
  only 
  cases 
  hitherto 
  investi- 
  

   gated 
  has 
  been 
  shown 
  to 
  be 
  of 
  a 
  dual 
  nature, 
  the 
  general 
  

   non-hypothetical 
  term 
  sorption 
  is 
  proposed 
  to 
  embrace 
  all 
  

   adsorption 
  and 
  occlusion 
  phenomena. 
  

  

  University 
  of 
  Bristol. 
  

   July 
  27, 
  1908. 
  

  

  C. 
  Proceedings 
  of 
  Learned 
  Societies, 
  

  

  GEOLOGICAL 
  SOCIETY. 
  

  

  [Continued 
  from 
  p. 
  820.] 
  

  

  April 
  7tb, 
  1909.— 
  Prof. 
  W. 
  J. 
  SoUas. 
  LL.D., 
  Sc.D., 
  F.li.S., 
  President, 
  

   and 
  afterwards 
  H. 
  "W. 
  Monckton, 
  Treas.L.S., 
  Vice-President, 
  in 
  

   the 
  Chair. 
  

  

  ^HE 
  following 
  communications 
  were 
  read 
  : 
  — 
  

  

  ]. 
  'On 
  Overthrusts 
  at 
  Tintagel 
  (iS'orth 
  Cornwall).' 
  By 
  

   Henry 
  Dewey, 
  F.G.S. 
  

  

  In 
  this 
  paper 
  the 
  author 
  deals 
  with 
  the 
  geological 
  structure 
  of 
  the 
  

   Tintagel 
  area. 
  After 
  brief 
  reference 
  to 
  the 
  stratigraphy 
  north 
  of 
  

   Bodmin 
  Moor, 
  mention 
  is 
  made 
  of 
  the 
  apparent 
  difference 
  in 
  order 
  

   of 
  superposition 
  of 
  the 
  beds 
  near 
  Tintagel. 
  

  

  The 
  several 
  types 
  into 
  which 
  the 
  Upper 
  Devonian 
  rocks 
  are 
  

   divided 
  are 
  next 
  described. 
  The 
  beds 
  in 
  descending 
  order 
  are 
  : 
  — 
  

  

  (6) 
  Tredorn 
  PhyUites. 
  

  

  (5) 
  Trambley 
  Cove 
  Gritty 
  Slates. 
  

  

  (4) 
  Volcanic 
  Series. 
  

  

  (3) 
  Barras 
  Nose 
  Beds. 
  

  

  (2) 
  Woolgarden 
  Phyllites. 
  

  

  (1) 
  Delabule 
  Slates. 
  

  

  The 
  above 
  order 
  is 
  preserved 
  for 
  many 
  miles, 
  between 
  the 
  Boscastle 
  

   coast 
  and 
  Lewaunick 
  on 
  the 
  eastern 
  side 
  of 
  Bodmin 
  Moor. 
  A 
  

   change 
  of 
  strike 
  at 
  Tintagel 
  reveals 
  the 
  anticlinal 
  structure 
  of 
  the 
  

   district. 
  To 
  the 
  south 
  of 
  the 
  nose 
  of 
  this 
  great 
  fold, 
  minor 
  folds 
  

   cross 
  the 
  strike. 
  These 
  folds 
  increase 
  westwards, 
  until 
  they 
  are 
  

  

  