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 1842, 



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PEEFACE TO THE TENTH EDITION. 



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their arrangement and relative position, and their organic 

 contents, which, when deciphered by aid of the key supplied 

 by the study of the modern changes above alluded to, reveal 

 to us the annals of a grand succession of past events— a series 

 of revolutions which the solid exterior of the globe, and its 



times almost 



man 



In thus separating the two works, however, I have retained 



in the 



some matters 



mie-ht fairlv be regarded as common 



exam 



geology, followed by a series of preliminary essays to explain 

 the facts and arguments which lead me to believe that the 

 forces now operating upon and beneath the earth's surface 

 may be the same, both in kind and degree, as those which at 

 remote epochs have worked out geological changes. 



If I am asked whether the < Principles ' or the < Elements * 

 should be studied first, I feel much the same difficulty in 

 answering the question as if a student should enquire whether 

 he ought to take up first a treatise on Chemistry, or one on 

 Natural Philosophy, subjects sufficiently distinct, yet insepa- 

 rably connected. On the whole, while I have endeavoured to 

 make each of the two treatises, in their present form, quite 



ecommend 



modern 



volume 



afterwards to the classification and interpretation of the 

 monuments of more remote ages. 



It will be seen in the foregoing list of the dates of publi- 



Man 



brought out a volume 

 state the title more 1 



fully, 'On the 

 Geological Evidences of the Antiquity of Man, with Eemarks 

 on Theories of the Origin of Species by Variation.' 



The subject-matter of this work coincided in part with 



liave 



