IV PREFACE. 



constructed a model of the state, about fifteen feet in length, on the scale of 

 one mile to the inch horizontally, and one thousand feet to the inch verti- 

 cally. Copies of this model are to be found at Concord and Hanover. It is 

 our belief that this topographical model is one of the most important prac- 

 tical results of the survey. Special attention is called to the unique method 

 of arranging rocks, in relation to geography and structural geology, described 

 in Chapter IX. 



Arrangements have been made for the publication of our geological map, 

 upon the scale of two and a half inches to the mile, in the best style, by Julius 

 Bien, of New York. The engraving is completed, and it only remains to 

 execute the coloring. We had hoped the sheets might be ready for distribu- 

 tion with this volume. Most of the descriptions refer to the map, so that 

 they cannot be thoroughly understood without it. 



C. H. HITCHCOCK. 

 Hanover, May 12, 1877. 



