fr\ TH K 



QUARTERLY JOURNAL 



or the ^ 



GEOLOGICAL SOCIETY OF LONDON/ 



EDITED BY 



THE PERMANENT SECRETARY OF THE GEOLOGICAL SOCIETY. 



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

 penetrare ; atque non disputando adversariiun, sed opere naturam vincere ; denique non belle et probabiliter 

 opinari, sed certo et ostensive scire ; tales, tanquam veri scieutiarum filii, nobis (si videbitui') se adjungan t 

 — Novum Organum, Prcefatio. 



VOLUME THE SEVENTY-FOURTH, 



FOR 1918. y/ 



^sonian In - 



( mam 



LONDON : '*£& 



LONGMANS, GREEN, AND CO. 



PARIS: CHARLES KLINCKSIECK, 11 RUE DE LILLE. 

 SOLD ALSO AT THE APARTMENTS OF THE SOCIETY, 

 MCMXIX. 



