THE 



QUARTERLY JOURNAL 



GEOLOGICAL SOCIETY OF LONDON. 



EDITED r.Y 



THE ASSISTANT-SECRETARY OF THE GEOLOGICAL SOCIETY. 



Quod si cui mortahum cordi et curse sit non tantuni inventis hierere, atquc iis uti, sed ad ulteriora 

 peuetrare ; atque non disputando adversarium, sed opere naturam vincere ; denique non belle ct probabiliter 

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

 — Novum Organum, Prmfatio. 



VOLUME THE FIFTIETH^ 



1894. 4^ 



LONDON ; 



2S4 31 fe 



J Himni $$$>- 



LONGMANS, GREEN, AND CO. 



PARIS: FRIED. KLINCKSIECK, 11 RUE DE LILLE; F. SAW, 77 BOULEVARD ST. GER.AIAIX ; 



LEIPZIG: T. O.WEIGEL. 



SOLD ALSO AT THE APARTMENTS OF THE SOCIETY. 



MDCCCXC1V. 



