ALTITUDES. 293 



to Lebanon village ; and only a short distance up the other tributaries. 

 It passes up the Passumpsic river five or six miles. 



The 500-feet line passes a few miles into New Hampshire along the 

 Ossipee and Saco valleys. The two contours almost connect on the Mad- 

 ison summit of the Portsmouth, Great Falls & Conway Railroad, and, on 

 the Saco, the line passes to Lower Bartlett. 



The 1000-feet line. On the Androscoggin this line extends to the top 

 of Berlin falls, and to the west line of Gorham on Moose river. On the 

 Saco it reaches to the mouth of Nancy's brook, near the residence of Dr. 

 S. A. Bemis, also two or three miles up Sawyer's river, and above Jackson 

 on the Ellis river. On Swift river it extends to the west part of Albany. 

 It then follows the foot hills of the White Mountains to the junction of 

 the main branches of the Pemigewasset river at North Woodstock, having 

 run two or three miles into Waterville along Mad river. The line from 

 the Pemigewasset passes into the valley of Baker's river to the north part 

 of Warren, returning on the west side to Bridgewater, thence curves 

 around Newfound lake, and can be traced to the valley of Smith river, 

 whence it passes to the highest summit on the Northern Railroad in 

 Orange. The railroad has been excavated beneath the thousand-feet level 

 at this divide ; but there are a few rods' width of the natural surface of 

 the ground which rise above that level. The line next passes in a south- 

 erly direction to Massachusetts, curving very much easterly to pass 

 around Mt. Kearsarge, returning to the railroad summit in Newbury, and 

 reaching the towns of Jaffrey and Sharon on the Contoocook river before 

 coming back to Deering and Weare on the east side of the same valley. 

 The line leaves the state in New Ipswich. 



The most prominent islands to the south-east of the line just described 

 are the Eaton-Madison heights, Ossipee Mountain group, Green moun- 

 tains in Effingham, the mountains between Strafford and Carroll counties, 

 the Gunstock and Belknap range, Red hill, New Hampton and Sanborn- 

 ton heights, Ragged mountains in Hill and Andover, and the Uncanoonucs 

 in Goffstown. 



On the west side of the Merrimack-Connecticut water-shed we find the 

 area between the mill-pond and Troy, on the Cheshire Railroad, to be 

 above one thousand feet, the line curving westerly from the south part of 

 Fitzwilliam around Richmond to Troy. Thence it proceeds nearly to 



