■V/2 



THE 



QUARTERLY JOURNAL 



GEOLOGICAL- SOCIETY OF LONDON. 



EDITED BY 



THE PERMANENT SECRETARY OF .THE GEOLOGICAL SOCIETY. 



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

 penetrare ; atque non disputando adversarium, sied opere naturam vincere ; deniqne non belle et probabiliter 

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

 — "Novum Organum, Prcefatio. • 



VOLUME THE SEVENTY-FIFTH, 

 for 1919. 



NOV 9 1920 



LONDON : 



LONGMANS, GREEN, AND CO. 



PAEIS: CHARLES KLINCKSIECK, 11 RUE DE LILLE. 



SOLD ALSO AT THE APARTMENTS OF THE SOCIETY, 



JICMXX. 



