﻿48 
  A. 
  C. 
  Lane 
  — 
  Lawsorfs 
  Correlation. 
  

  

  In 
  so 
  far, 
  for 
  instance, 
  as 
  an 
  iron 
  formation 
  is 
  due 
  to 
  the 
  

   alteration 
  of 
  cherty 
  carbonate 
  it 
  might 
  well 
  be 
  formed 
  in 
  azoic. 
  

   But 
  I 
  have 
  already 
  pointed 
  out 
  that 
  it 
  is 
  extremely 
  easy 
  to 
  in- 
  

   clude 
  in 
  the 
  azoic 
  masses 
  of 
  rock 
  faulted 
  into 
  it 
  before 
  the 
  

   whole 
  series 
  was 
  metamorphosed 
  or 
  invaded 
  by 
  granite. 
  And 
  

   after 
  all, 
  while 
  correlations 
  may 
  differ, 
  it 
  will 
  be 
  found 
  pretty 
  

   generally 
  that 
  writers 
  have 
  some 
  " 
  greenstone 
  " 
  formation 
  

   below 
  their 
  jaspilite 
  formation 
  even 
  when 
  they 
  do 
  not 
  class 
  this 
  

   latter 
  as 
  Huronian. 
  

  

  Nor 
  do 
  I 
  wish 
  to 
  imply 
  that 
  it 
  is 
  at 
  all 
  necessary 
  to 
  adopt 
  all 
  

   the 
  above 
  suggestions 
  if 
  one 
  rejects 
  Lawson's 
  interesting 
  hypo- 
  

   thesis. 
  [ 
  have 
  pointed 
  out 
  : 
  first, 
  that 
  Lawson's 
  hypothesis 
  

   meets 
  fatal 
  objections 
  in 
  the 
  facts 
  (if 
  they 
  are 
  such) 
  presented 
  

   by 
  other 
  geologists 
  quite 
  as 
  familiar 
  with 
  them 
  as 
  he, 
  whose 
  

   testimony 
  he 
  is 
  quite 
  willing 
  to 
  accept 
  when 
  it 
  does 
  not 
  con- 
  

   flict 
  with 
  the 
  hypothesis 
  ; 
  and 
  secondarily 
  only, 
  that 
  the 
  

   advantages 
  which 
  it 
  seems 
  to 
  me 
  led 
  him 
  to 
  favor 
  this 
  hypo- 
  

   thesis 
  may 
  be 
  obtained 
  by 
  an 
  hypothesis 
  that 
  I 
  favor. 
  But 
  

   there 
  is 
  no 
  necessary 
  connection 
  between 
  the 
  two 
  hypotheses, 
  

   so 
  that 
  one 
  or 
  the 
  other 
  must 
  be 
  true. 
  Both 
  might 
  be 
  false, 
  

   and 
  the 
  best 
  basis 
  of 
  correlation 
  yet 
  awaits 
  exposition. 
  

  

  Barnum 
  Museum, 
  Tufts 
  College, 
  Mass. 
  

  

  