﻿110 
  PBOF. 
  T. 
  G. 
  BONNET 
  ON 
  TWO 
  TRAVERSES 
  OF 
  THE 
  

  

  in 
  many 
  cases 
  did 
  not 
  date 
  from 
  a 
  period 
  extremely 
  aucient, 
  but 
  

   rather 
  from 
  the 
  period 
  of 
  upheaval. 
  Lawson 
  declares 
  that 
  certain 
  

   of 
  the 
  banded 
  gneisses 
  of 
  Canada, 
  hitherto 
  known 
  as 
  Lauren 
  tian, 
  

   are 
  intrusive 
  igneous 
  masses. 
  M 
  c 
  Mahon 
  also 
  had 
  pointed 
  out 
  

   the 
  intrusive 
  character 
  of 
  gneissic 
  masses 
  of 
  the 
  Himalayas. 
  In 
  the 
  

   above 
  remarks 
  he 
  had 
  put 
  forward 
  the 
  views 
  of 
  other 
  people, 
  but 
  

   his 
  own 
  work 
  had 
  led 
  him 
  in 
  the 
  same 
  direction, 
  and 
  he 
  concluded 
  

   that 
  there 
  was 
  no 
  safety 
  except 
  on 
  the 
  solid 
  ground 
  of 
  rational 
  

   uniformitarianism. 
  

  

  Dr. 
  Hicks 
  denied 
  that 
  there 
  was 
  any 
  evidence 
  in 
  this 
  country 
  of 
  

   such 
  metamorphism 
  of 
  the 
  newer 
  rocks 
  on 
  a 
  large 
  scale. 
  We 
  were 
  

   told 
  that 
  these 
  crystalline 
  schists 
  may 
  be 
  of 
  any 
  age. 
  Though 
  there 
  

   are 
  fossiis 
  in 
  an 
  altered 
  rock 
  at 
  one 
  spot, 
  this 
  surely 
  is 
  not 
  evidence 
  

   enough 
  to 
  tempt 
  us 
  to 
  regard 
  the 
  whole 
  of 
  the 
  non-fossiliferous 
  

   portion 
  as 
  necessarily 
  of 
  Jurassic 
  age. 
  Why 
  should 
  the 
  fossils 
  be 
  

   present 
  at 
  one 
  place 
  and 
  entirely 
  absent 
  in 
  all 
  the 
  rest 
  of 
  the 
  area 
  if 
  

   the 
  rocks 
  are 
  of 
  the 
  same 
  age 
  ? 
  

  

  Mr. 
  Baferman 
  was 
  sorry 
  that 
  there 
  was 
  not 
  more 
  expert- 
  know- 
  

   ledge 
  available 
  for 
  the 
  discussion 
  of 
  the 
  paper. 
  Heim's 
  results 
  

   were, 
  he 
  believed, 
  obtained 
  in 
  the 
  Central 
  Alps, 
  and 
  not 
  in 
  either 
  

   of 
  the 
  districts 
  under 
  review. 
  He 
  was 
  not 
  acquainted 
  with 
  the 
  

   eastern 
  section 
  brought 
  forward 
  by 
  the 
  Author, 
  but 
  that 
  across 
  the 
  

   Maurienne 
  appeared 
  to 
  him 
  to 
  represent 
  the 
  structure 
  of 
  the 
  country 
  

   as 
  he 
  had 
  seen 
  it. 
  

  

  Prof. 
  Blake 
  remarked 
  that 
  Heim 
  distinctly 
  stated 
  that 
  his 
  region 
  

   of 
  the 
  Alps 
  was 
  not 
  suited 
  to 
  determine 
  the 
  succession 
  of 
  the 
  schists, 
  

   but 
  that 
  Lory, 
  who 
  had 
  studied 
  the 
  same 
  district 
  as 
  the 
  Author, 
  

   found 
  there 
  a 
  true 
  stratigraphical 
  sequence 
  ; 
  he 
  also 
  inquired 
  with 
  

   regard 
  to 
  the 
  Silurians 
  shown 
  on 
  the 
  map, 
  if 
  the 
  schists 
  are 
  any- 
  

   where 
  seen 
  to 
  underlie 
  these. 
  

  

  Dr. 
  Geikie, 
  while 
  acknowledging 
  the 
  unwearied 
  industry 
  of 
  the 
  

   Author, 
  expressed 
  his 
  doubts 
  as 
  to 
  the 
  success 
  of 
  attempts 
  to 
  make 
  

   out 
  an 
  order 
  of 
  succession 
  among 
  the 
  crystalline 
  schists, 
  except 
  upon 
  

   very 
  detailed 
  work. 
  As 
  regards 
  the 
  Alps, 
  it 
  is 
  a 
  fact 
  that 
  Belem- 
  

   nites 
  occur 
  in 
  a 
  truly 
  schistose 
  garnetiferous 
  rock. 
  The 
  evidence 
  of 
  

   Heim 
  and 
  others 
  went 
  to 
  show 
  that 
  infoldings 
  of 
  Jurassic 
  rocks 
  had 
  

   become 
  truly 
  crystalline. 
  The 
  question 
  to 
  be 
  settled 
  was 
  how 
  much 
  

   of 
  the 
  crystalline 
  schists 
  of 
  the 
  Alps 
  were 
  originally 
  sedimentary 
  

   rocks. 
  

  

  The 
  AuTnoR, 
  in 
  reply, 
  said 
  that 
  the 
  grouping 
  had 
  been 
  somewhat 
  

   reduced, 
  but 
  that 
  he 
  had 
  always 
  been 
  doubtful 
  with 
  regard 
  to 
  the 
  

   pietre 
  verde. 
  He 
  accepted 
  the 
  issue 
  as 
  stated 
  by 
  Mr. 
  Teall, 
  for 
  he 
  

   had 
  fully 
  expected 
  to 
  hear 
  of 
  the 
  Beleranites 
  ; 
  he 
  had 
  not 
  been 
  

   profoundly 
  impressed 
  by 
  the 
  views 
  of 
  Mr. 
  Lawson 
  ; 
  and 
  had 
  always 
  

   admitted 
  11k 
  1 
  possibility 
  of 
  some 
  of 
  these 
  structures 
  having 
  been 
  

   subsequently 
  produced. 
  His 
  faith 
  in 
  dynamic 
  metamorphism 
  had 
  

   certainly 
  increased, 
  but 
  that 
  was 
  no 
  reason 
  why 
  he 
  should 
  allow 
  it 
  

   to 
  become 
  a 
  superstition. 
  But 
  he 
  maintained 
  that 
  these 
  banded 
  

   structures 
  were 
  different 
  from 
  those 
  produced 
  by 
  the 
  last 
  great 
  move- 
  

   ments 
  in 
  the 
  Alps. 
  Throughout 
  the 
  whole 
  of 
  the 
  Alps 
  certain 
  

  

  