UNIFORMITY IN GEOLOGICAL CHANGE 

 SIR CHARLES LYELL 



[Sir Charles Lyell, the greatest of English geologists, in 

 the chapter which follows from the eleventh edition of his 

 "Principles of Geology," gave original and powerful support 

 to the theory of evolution. His methods of inquiry and 

 his arguments had much influence on the mind of Charles 

 Darwin. The work here laid under contribution is pub- 

 lished by D. Appleton & Co., New York. The books by 

 Professor Shaler, named on page 139 of this volume, will 

 serve as admirable supplementary reading. Sir Archibald 

 Geikie's "Text-Book of Geology, " published by the Mac- 

 millan Company, New York, in its latest edition is the best 

 work on the subject in the English language .Q 



ORIGIN OF THE DOCTRINE OF ALTERNATE PERIODS 

 OF REPOSE AND DISORDER 



IT HAS been truly observed, that when we 

 arrange the fossiliferous formations in chrono- 

 logical order, they constitute a broken and defec- 

 tive series of monuments: we pass without any 

 intermediate gradations from systems of strata 

 which are horizontal, to other systems which are 

 highly inclined from rocks of peculiar mineral 

 composition to others which have a character 

 wholly distinct from one assemblage of organic 

 remains to another, in which frequently nearly 

 all the species and a large part of the genera, are 

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