46 PHYSICAL GEOGRAPHY. 



MAP SURVEYS AND LEVELLING. 



Some of the new material obtained for perfecting the map in 1870 was 

 the following : 



First, a new map of Connecticut river, from Massachusetts to Connec- 

 ticut lake. Part of this was surveyed in 1825, with the expectation that 

 a canal would be built along the river, as high as Mclndoe's falls, in Bath. 

 This very valuable map was presented to the survey by Dr. E. E. Phelps, 

 of Windsor, Vt. It is superior to the county maps or the state map of 

 Vermont, and is therefore the best one in existence. It represents things 

 as they were in 1825; but there has been little change since that time 

 except in the construction of new turnpikes and railroads. 



Second, Messrs. Walling and Gray were employed late in the season to 

 prepare a map of the river between Bath and Connecticut lake, from new 

 surveys. This has been done carefully, and constitutes a very important 

 addition to our materials for the final map. These same engineers also 

 made careful odometer surveys of the Mt. Washington carriage road and 

 the Fabyan turnpike, which are in our possession. 



We commenced this year the preparation of a raised map of the state, 

 for the museum, upon the scale of one mile to the inch. The table to 

 serve as its foundation was placed in position, and nearly all the outside 

 boundaries of the state drawn upon it. In 1871 Mr. Huntington drew 

 contour lines for all of Coos county north of Shelburne and Lancaster, 

 from which the north portion of the model has been constructed. At the 

 same time I constructed a plan of the Franconia and Bethlehem moun- 

 tains upon a much larger scale. This was designed to illustrate the 

 theory of Prof. Agassiz respecting the northward transportation of boul- 

 ders by a local glacier from the Franconia Mountains. 



Additional work upon the model of the whole state was performed in 

 1873. It will not be best to complete this until the last item of facts con- 

 cerning the topography of the state has been garnered in. The general 

 facts upon which this is based will appear in the chapter upon topography. 



The surveying necessary for the mapping of a part of the Ammo- 

 noosuc gold field, referred to heretofore, was completed in 1870. The 

 last part of the work, setting the stakes for more than two square miles, 



