SSO. befor 
(3 
cTEO!: 
THE 
QUARTERLY JOURNAL 
GEOLOGICAL SOCIETY OF LONDON. 
EDITED BY 
THE ASSISTANT-SECRETARY OF THE GEOLOGICAL SOCIETY. 
Quod si cui mortalium cordi et cure sit non tantum inventis herere, 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) se adjungant, 
—Novum Organum, Prefatio. 
ARSONAN INST FS 
Vi 
VOLUME THE FORTIETH. Z 
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ae marion, WE 
LONDON: 
LONGMANS, GREEN, READER, AND DYER. 
PARIS; BRIED: KLINCKSIECK, 11 RUE DE LILLE; F, SAVY, 24 RUE HAUTEFEUILLE, 
LEIPZIG: T.0O. WEIGEL, 
SOLD ALSO AT THE APARTMENTS OF THE SOCIETY, 
MDCCCLXXXIV. 
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