SCIENTIFIC SURVEY. 353 



on account of tbcir numbers and extent, (some of them passing 

 over a stretch of fifty or more miles,) they certainly would demand 

 no brief space of time and care in their investigation. 



Whatever may be their extent, or their direction, they all have a 

 similarity of character and accompaniments. They are, in fact, em- 

 bankments of gravel, sand and rolled pebbles, of different heights 

 and widths — a stream on one side, and often a bog or a morass in 

 some parts of their extent on the other. 



For one thing they are peculiarly fitted. They afford capital 

 roading by the dry, well-drained and compact bed they furnish on 

 which to travel. What the real extent of this one is, we could not 

 well ascertain, on account of the forest covering the country on 

 every side — from appearances, however, as indicated by growth, 

 &c. — it rises some distance north from where the road strikes it, 

 probably from a spur of Haybrook mountains — running southerly 

 to this point, then curving westerly extends three or four miles to 

 the Seboois river which passes through it— thence, a short dis- 

 tance from the west bank, it curves northerly continuing eight or 

 ten miles, until it strikes the south margin of second Seboois lake 

 where it drops off giving place to the lake, but again rises on its 

 northern shore and is lost in the forest beyond. 



Six miles farther west, directly in the rear of the " Seboois 

 House," is another one. This also rises somewhere in the forest 

 northwesterly from this house, and when near to it curves around 

 easterly, passing again into the forest ; how far, I had no means of 

 ascertaining. At the turn of the curve is a singular gap, or break, 

 sufficiently wide to allow the road to pass through without any 

 change of grade. This " horseback" is similar in its characteristic 

 features to all the others. If all of the formations of this kind, 

 that could be found in this State, were accurately traced out and 

 mapped, they would present a singular and interesting representa- 

 tion of what was, probably, one stage of the Lacustrine era of the 

 surface of Maine irfthe remote ages of the past; and might afford 

 a satisfactory explanation of many changes which have since taken 

 place on this part of the face of the earth. 



The Gorge of the Seboois or Godfreifs Falls. 

 At the point where the supply road mentioned above, strikes the 

 Seboois river, a rough, but strong bridge has been thrown across 

 the water ; and a little above it, has been built a dam by the lumber- 



