

3^-</<S 



THE 



QUARTERLY JOURNAL 



GEOLOGICAL SOCIETY OF LONDON. 



EDITED BY 



THE ASSISTANT-SECRETARY OE THE GEOLOGICAL SOCIETY. 



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

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

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

 —Novum Organum, Prce/atio. 



VOLUME THE THIRTY-NK^i^ 



,883 ' "aSH^U? 



LONDON : 

 LONGMANS, GREEN, READER, AND DYER. 



PARIS! FRIED. KLINCKSIECK, 11 RUE DE LILLE; P. SAVY, 24 RUE HAUTEFEUILLE. 

 LEIPZIG: T. O.WEIGEL. 



SOLD ALSO AT THE APARTMENTS OP THE SOCIETY, 

 MDCCCLXXX1II. 



