VI ADVERTISEMENT. 



may appear in the following pages without reference, 

 or clue acknowledgment; for, in the multiplicity of 

 subjects comprised in this edition, I am appre- 

 hensive that I may, in some instances, have 

 inadvertently stated as original, ideas and suggestions, 

 unconsciously derived from the works of others. 



The style and arrangement of the Lectures have 

 been retained, as it appeared inexpedient to alter 

 the plan of a work of which ten thousand copies have 

 been issued, and which has been republished in 

 America, and translated into German by an eminent 

 Professor of the University of Bonn. 



To render these volumes available to the purchasers 

 of " The Medals of Creation," a table of the refe- 

 rences to the "Wonders of Geology" in that work, 

 corrected for this edition, is annexed ; for the two 

 w r orks are intended to illustrate each other : the 

 present volumes offering a familiar exposition of the 

 Philosophy of Geology, and The Medals a compen- 

 dious view of the Principles of Palwontoloay. 



19, Chester Square, 

 Pihlico, 



