LONDON:
HODDER & STOUGHTON,
27, PATERNOSTER ROW.
MDCCCLXXV.
Butler & Tanner,
The Selwood Printing Works,
Frome, and London.
SIR WILLIAM EDMOND LOGAN,
LL.D., F.R.S., F.G.S.,
THIS WORK IS DEDICATED,
Not merely as a fitting acknowledgment of his long and successful labours in the geology of those most ancient rocks, first named by him Laurentian, and which have afforded the earliest known traces of the beginning of life, but also as a tribute of sincere personal esteem and regard to the memory of one who, while he attained to the highest eminence as a student of nature, was also distinguished by his patriotism and public spirit, by the simplicity and earnestness of his character, and by the warmth of his friendships.