SCIENTIFIC SURVEY. 339 



Near Princeton are two horsebacks. Both are on the railroad, 

 one in Princeton and the other in Baileyville. The latter is the 

 largest, being- five miles in length. It has a large slope towards 

 the Kennebasis river, which is unusual. Both cross the river valley 

 with a N. E. and S. W. course. 



The only other horseback seen having a slope is in the southeast 

 part of Bingham. It slopes at an angle of 2° 30', and shows itself 

 for half a mile near a carriage road. It lies on the west side of the 

 valley, with somewhat of a south-easterly course, and runs into 

 moraine terraces. 



On the west shore of the Eastern Schoodic Grand lake is a very 

 well marked horseback, though not very long. Wc cannot vouch 

 from personal examination that it is over half a mile in length. It 

 is in Weston. 



In the north part of Weston we were permitted to see the south- 

 ern termination of the great horseback extending from Houlton to 

 Weston. It suddenly curves to the east, and in less than half a 

 mile's distance terminates in a swamp, graduall^"^ dying away. It 

 is probable that the horseback in the south part of Weston was 

 formed by the same general causes which produced the large ones, 

 and we shall expect to learn that the two are connected together 

 by other links, now concealed in the forest on the low land. 



In Linneus, north of the post oflSce, there is a very crooked horse- 

 back nearly a mile long. Its southern end is in a small pond near 

 the village. In the north part of its course, it is accompanied by 

 moraine terraces. It lies west of the great horseback of Houlton. 

 In Houlton we remarked that the material of which the horseback 

 was composed was stratified black gravel ; while the mounds which 

 we have considered to be moraine terraces on the east side are 

 composed of unmodified loamy material, with frequent fragments 

 of slate. It would hence appear that the two classes of deposits 

 must have been formed by different agencies, although they may 

 have operated at the same time. 



A fine horseback at Leadbetter falls on the Penobscot, terminat- 

 ing in a ledge, has already been spoken of in C. 



By all odds the largest horseback we have seen in Maine is what 

 is called the " Whale's back" in Aurora. The air line road passes 

 over it for three and a quarter miles in a south-easterly direction. 

 The horseback then continues on in the woods to an unknown 

 extent. We passed over it too early in the morning to estimate 

 its altitude and width with any precision. 



