ELEMENTS 



OF 



GEOLOGY 



BY 



CHARLES LYELL, F.R.S. 



VICE-PRESIDENT OF THE GEOLOGICAL SOCIETY OF LONDON, ETC. ; 

 AUTHOR OF "PRINCIPLES OF GEOLOGY." 



" It is a philosophy which never rests its law is progress : a point which yesterday was invisible a its goal 

 today, and will be its starting-post to-morrow." Edin. Seo. 



"Part of the present Treatise was written originally in the form of a supplement to my former work enti- 

 tled ' Principles of Geology,' and was intended for the use of those students who found certain chapters in 

 the 'Principles' obscure and difficult, for want of preliminary information. I afterwards considered that it 

 would not be incompatible with this object to enlarge the ' Elements' into a separate and independent treatise, 



to serve as an Introduction to Geology proper The volume now offered to the public, is neither 



an epitome of the 'Principles,' nor an abridgement of any part of that work." Extract from the Author** 

 Preface. 



FIRST AMERIC 

 FROM THE FIRST LONDON 



PHILADELPHIA: 



JAMES KAY, JUN. AND BROTHER, 122 CHESTNUT STREET. 



PITTSBURGH: C. H. KAY & CO. 



1839. 





