388 BOARD OF AGRICULTURE. 



My conclusions, therefore, from the facts which I have enumer- 

 ated, are, that a glacier once filled the basin between the Camden 

 hills on the west, and those of Mount Desert on the east, forty 

 miles wide — extended to a great distance north, involving several 

 hills beside those mentioned, of a thousand feet high, and certainly 

 not less than three thousand feet thick. 



And, it has suggested itself to me, that glacial action of the coast 

 of Maine, has utterly removed the tertiary deposits from her sur- 

 face ; for if they are presumed to be yet under water, certainly a 

 country like the present, could not be said to be a tertiary one. 



If these hasty sheets will be acceptable to you, you are very 

 welcome to them. Very truly yours, 



JOHN DeLASKI. 



December, 1862, 



Horsebacks. 



We are able to add several more horsebacks to the seventeen 

 enumerated in the preliminar}' report. The first is one brought to 

 our notice by the Maine Farmer, whose account of it we quote: 



" There is one of these horsebacks in the northern part of Somer- 

 set county, which we have not seen described, and therefore adds 

 another one to the list. It is situated partly in number 2, range 

 2, west of the Kennebec, and partly in Jerusalem township in 

 Franklin county. Its general course is N. W. and S. E., although 

 it is interrupted by many short zigzag turns. It is nearly five 

 miles in length, and from twenty to sixty feet in height. Occa- 

 sionally there are sharp pitches or depressions through its course, 

 and here there seem to be a predominance of boulders ranging in 

 size from a hen's egg to a two-quart measure, while on ascending 

 the horseback from these gullies, coarse sand or gravel seems to be 

 the formation. On either side of this horseback, for the whole dis- 

 tance, is a peaty swamp, in places covered with a black growth, 

 and at other places — where the growth has been burnt — showing a 

 stream with a mucky bottom, forming at one place a pond of con- 

 siderable size. At several places on the bog, there are considera- 

 ble quantities of cranberries, but they are small in size and inferior 

 in quality. The people in the vicinity regard this horseback as 

 formed on purpose for a road ; and it would seem that such were 

 the designs of Providence, for it is the only place for the entire five 

 miles that it would be possible to build a road for public travel." 



