PREFACE. ix 



of Albany, N.Y.; and W. C. Minor and Frank H. Bradley, 

 of New Haven. Mr. Bradley has given freely his constant as- 

 sistance during the progress of the work through the press. 



The author has endeavored to bring the volume into as small 

 a compass as is consistent with a proper exhibition of the 

 science; and if some find its pages too numerous, he feels con- 

 fident that quite as many would prefer greater fulness. The 

 details introduced have seemed to be necessary in order that the 

 march of events might be appreciated. 



Geology is rapidly taking its place as an introduction to the 

 higher history of man. If the author has sought to exalt a 

 favorite science, it has been with the desire that man — in whom 

 geological history had its consummation, the prophecies of the 

 successive ages their fulfilment — might better comprehend his 

 own nobility and the true purpose of his existence. 



New Haven, Ct., November 1, 1862. 



