128 PHYSICAL GEOGRAPHY. 



Railway. The isotheral of 62 '^ is in the towns of Colebrook, Dixville, 

 and Errol; and that of 47" touches the top of Mt. Washington. 



The general direction of the isochimenal lines are the same as those of 

 the isotheral. We have an island of cold on the line between Cheshire 

 and Hillsborough counties, a warm area in the vicinity of Manchester, a 

 gradual increase of the cold inland from the ocean at Portsmouth, and 

 the same deflection northward, — but not to so great a degree, — of the 

 lines beginning at the Connecticut. The marked conformity of the 

 isochimenals of 19°, 17,° and 16°, with the isotherals of 65°, 63°, and 

 62°, is quite remarkable. 



Chart III. We have here represented the entire annual aqueous pre- 

 cipitation. The area of greatest precipitation is in the central portion 

 of the state, in the vicinity of Newfound lake, and it extends north at 

 least as far as Ashland, and southward probably as far as Franklin. The 

 rain-fall in this area, including melted snow, is 46 inches. There is an 

 area of 45 inches from Hooksett southward toward the state line, and the 

 table would give us a small area in the vicinity of West Enfield ; but, as 

 there seems to be some doubt as to the accuracy for that locality, we have 

 omitted it on the chart. In the south-west part of the state, below a line 

 from Claremont and extending to a point just north of Concord, there is 

 a large area where the precipitation is 43 inches. There is an area 

 of 42 inches north of Claremont, perhaps ten miles in width, extending 

 to the Merrimack river, thence northward along the west side of Lake 

 Winnipiseogee, when the area widens so that it includes almost the whole 

 portion of the state north of the lake to a line above the Grand Trunk 

 Railway. In the north part of the state, above 42, there is an area of 

 41 inches extending across the state, and having a width of about twenty 

 miles. There is another small area of 41 inches, extending from Bath in 

 a curve southward as far as Plainfield. Between this and the Connec- 

 ticut, embracing a part of Orford, Lyme, and Hanover, there is an area 

 where the precipitation is only a little more than 40 inches. Also, the 

 whole portion of the state north of Stratford is included in the area of 40 

 inches. On the sea-coast, at least in the vicinity of Portsmouth, the rain- 

 fall is less than in any other part of the state, being 35 inches,— but it 

 increases as we go inland. At Dover there are 36 inches, and at Wolfe- 

 borough 38. Since the distribution of rain-fall depends in a measure on 



