268 POPULAR SCIENCE MONTHLY. 



its accuracy. The edition prepared for the Mining Institute em- 

 bodies all the information acquired for the large map, with such 

 additional facts as had been learned since that map was published. 

 Prof. Hitchcock's services were called into requisition in the compila- 

 tion of a similar map for the United States Geological Survey, which 

 was published in its annual report for 1886, under the editorship 

 of ¥ J McGee; in fact, the two maps were printed from the 

 same plates, but Dr. Hitchcock's contained certain features not found 

 in the other one — the result of different interpretations — and was 

 more complete. In the Government edition a system of coloration 

 devised by Major J. W. Powell, which was afterward abandoned, 

 was employed. 



Professor Hitchcock contributed extensively to the collection of 

 State geological maps in the Centennial Exhibition of 1876, when 

 large scale sheets of New England, and a large copy of the Hitch- 

 cock and Blake map of 1872, were exhibited. A medal was awarded 

 for a sheet of thirteen sections illustrating the stratigraphy of Ver- 

 mont and New Hampshire. The beginning of the measurement of 

 sections was made for the Vermont Geological Report under the 

 direction of Dr. Edward Hitchcock in 1861. Twelve lines of ex- 

 ploration across the entire State were determined upon, and speci- 

 mens were collected to illustrate all the varieties of rock seen upon 

 each. The specimens were arranged in the State Museum at Mont- 

 pelier in geographical order. A similar plan of collection and ar- 

 rangement was projected for the New Hampshire survey, but it 

 was made to extend across the two States, from Maine to New York. 

 Besides the two State reports, later publications were issued, descrip- 

 tive of explorations and collections for the Bulletin of the American 

 Museum of Natural History in New York, and the New Hampshire 

 Agricultural Report for 1883. The work did not cease with these 

 publications, for after the transfer of the collection of sections from 

 the New Hampshire College of Agriculture and the Mechanic Arts 

 to Dartmouth College in 1894, additional explorations were made; 

 the number of sections was increased to eighteen; improved drawings 

 of the profiles, colored geologically, were prepared for the cases in 

 the new Butterfield Museum ; and the explanation of the details was 

 further facilitated by the construction of a large relief map on the 

 scale of one mile to the inch horizontally, twice as much vertically, 

 and having colors corresponding to those on the profiles between the 

 shelves. About five thousand specimens have been gathered to illus- 

 trate the profiles. 



The Dartmouth College Museum is filled with specimens accu- 

 mulated by the energy of Professor Hitchcock. They concern ge- 

 ology, paleontology, petrography, economic botany, and conchology. 



