CHAPTER XII 



THE " MANUAL OF GEOLOGY" 



The Manual of Geology Dana's Contributions to this Science Analysis of 

 the Manual, by Prof. H. S. Williams Its Scientific Attitude The 

 Doctrine of Evolution. 



DANA'S Manual of Geology first appeared in 1862, and 

 the subsequent editions came in 1874, 1880, and 

 1895. This work, as his son has said, is not simply a 

 compilation of facts, but a development of the whole sub- 

 ject with a breadth, philosophy, and originality of treat- 

 ment that have seldom been attempted. 



Dana s Preparation for this Work 



' Each edition," continues the same authority, " was 

 carefully worked over, and the last was completely re- 

 written from beginning to end. It was a great pleasure 

 to him in connection with this work to have the constant 

 and ready co-operation of a number of the able young 

 geologists in the country, without whose aid the volume 

 could not have been so satisfactorily completed. Similar 

 co-operation and pleasant relations he had enjoyed while 

 at work upon his earlier volumes both in geology and 

 mineralogy, but this is hardly the place to speak of that 

 in detail. Allusion has also been made to the smaller 

 works, the Text-book (first edition, 1864), and the Geo- 

 logical Story (1875); of the last the manuscript of a new 

 edition is now [1895] in the printers' hands. 



In the general department of geology his contribu- 

 tions again were largely to subjects of a broad and philo- 

 sophical character; the origin of continents and of the 



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