“No natural phenomenon can be adequately studied in itself alone—but, to be understood, it must be considered as it stands connected with all Nature.”—Bacon.


Ninth Edition, completely Revised.

LONDON:

JOHN MURRAY, ALBEMARLE STREET.

1858.

The right of Translation is reserved.

LONDON: PRINTED BY W. CLOWES AND SONS, DUKE STREET, STAMFORD STREET,

AND CHARING CROSS.

This Book is Dedicated