v. 3 
TO 
RODERICK IMPEY MURCHISON, Esq., F.R.S., 
SfC 8$c. fyc. 
LATE PRESIDENT OF THE GEOLOGICAL SOCIETY. 
My dear Murchison, 
I have great pleasure in dedicating this volume to 
you, as it contains the results of some of our joint labours 
in the field, in Auvergne, Velay, and Piedmont — results which 
had not yet been communicated to the public through any 
other channel. 
When we quitted England together for a tour on the con- 
tinent, in May, 1828, the first sketch only of my < Principles of 
Geology ' was finished. Since that time you have watched the 
progress of the work with friendly interest, and, as President 
of the Geological Society, have twice expressed in your Anni- 
versary Addresses, your participation in many of my views, 
which were warmly controverted by others. The eulogy 
which you have lately pronounced from the chair, on the last 
part of my work, (whether I attribute your approval to the 
exercise of an unbiassed judgment or to the partiality of a 
friend,) could not fail to be most gratifying to my feelings, 
and I trust that you will long enjoy health and energy to 
continue to promote with enthusiasm the advancement of your 
favourite science. 
Believe me, my dear Murchison, 
Yours, &c. &c. 
Charles Lyell, 
