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  \ 
  

  

  THE 
  

  

  >- 
  

  

  QUARTERLY 
  JOURNAL 
  

  

  5" 
  3 
  

  

  GEOLOGICAL 
  SOCIETY 
  OF 
  LONDON 
  

  

  EDITED 
  BY 
  

  

  THE 
  ASSISTANT-SECRETARY 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  Quod 
  si 
  cui 
  mortalium 
  cordi 
  et 
  curae 
  sit 
  non 
  tantum 
  inventis 
  hserere, 
  atque 
  iis 
  uti, 
  sed 
  ad 
  ulteriora 
  

   penetrare 
  ; 
  atque 
  non 
  disputando 
  adversarium, 
  sed 
  opere 
  riaturam 
  vincere 
  ; 
  denique 
  non 
  belle 
  et 
  probabiliter 
  

   opinari, 
  sed 
  certo 
  et 
  ostensive 
  scire; 
  tales, 
  tanquam 
  veri 
  scientiarum 
  filii, 
  nobis 
  (si 
  videbitur) 
  seadjungant. 
  

   — 
  Novum 
  Organum, 
  Prcefatio. 
  

  

  VOLUME 
  THE 
  FIFTY-THIRD. 
  

  

  1897. 
  

  

  AUG 
  11 
  1930 
  * 
  

  

  M 
  ^380+ 
  

  

  LONDON: 
  

  

  LONGMANS, 
  GREEN, 
  AND 
  CO. 
  

  

  PARIS: 
  FRIED. 
  KLINCKSIECK, 
  11 
  RUE 
  DE 
  LILLE; 
  P. 
  SAVY, 
  77 
  BOULEVARD 
  ST. 
  GERMAIN, 
  

  

  LEIPZIG: 
  T. 
  O.WEIGEL. 
  

  

  SOLD 
  ALSO 
  AT 
  THE 
  APARTMENTS 
  OF 
  THE 
  SOCIETY. 
  

  

  MDCCCXCVII. 
  

  

  