^ , THE n 



QUARTERLY JOURNAL 



OF THE 



GEOLOGICAL SOCIETY OF LONDON. 



EDITED BY 



THE ASSISTANT-SECRETAKY OF THE GEOLOGICAL SOCIETY. 



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

 penetrare ; atque non dUputando adversarium, sed opere naturam vincere ; denique non belle et probabiliter 

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

 — Novum Organum, Prcefatio. 



VOLUME THE FIFTY-SEVENTH. 



1901. 



LONDON: ZZ^^^S 



LONGMANS, GREEN, AND CO. 



PARIS: CHARLES KLINCKSIECK, 11 RUE DE LILLE. 

 LEIPZIG; T. O.WEIGEL. 



SOLD ALSO AT THE APARTMENTS OP THE SOCIETY. 



MDCCCCI. 



