THE

QUARTERLY JOURNAL

54 6
&

GEOLOGICAL SOCIETY OF LONDON.

OF THE

EDITED BY

THE ASSISTANT-SECRETARY OF THE GEOLOGICAL SOCIETY.

Quod si cui mortalium cordi et curae sit non tantum inventis hærere, 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, Præfatio.

VOLUME THE THIRTY-FIRST.

1875.

LONDON:

LONGMANS, GREEN, READER, AND DYER.

PARIS: FRIED. KLINCKSIECK, 11 RUE DE LILLE; F. SAVY, 24 RUE HAUTEFEUille.

LEIPZIG: T. O. WEIGEL.

SOLD ALSO AT THE APARTMENTS OF THE SOCIETY,

MDCCCLXXV.