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CHAPTER VI. 



PROGRESS OF THE GEOLOGICAL DYNAMICS OF 

 ORGANIZED BEINGS. 



Sect. 1. Objects of this Science. 



PERHAPS in extending the term Geological 

 Dynamics to the causes of changes in organized 

 beings, I shall be thought to be employing a forced 

 and inconvenient phraseology. But it will be found 

 that, in order to treat geology in a truly scientific 

 manner, we must bring together all the classes of 

 speculations concerning known causes of change; 

 and the Organic Dynamics of Geology, or of Geo- 

 graphy, if the reader prefers the word, appears not 

 an inappropriate phrase for one part of this body of 

 researches. 



As has already been said, the species of plants 

 and animals which are found imbedded in the 

 strata of the earth, are not only different from those 

 which now live in the same regions, but, for the 

 most part, different from any now existing on the 

 face of the earth. The remains which we discover 

 imply a past state of things different from that 

 which now prevails ; they imply also that the whole 

 organic creation has been renewed, and that this 

 renewal has taken place several times. Such extra- 



