OF THE EARTH'S SURFACE. 185 



posure to the air, it has here lost every other symptom of dilu- 

 vian action. Another face of the same rock, sloping to the 

 south, which occupies the left hand mass of rock on the entry 

 to the quarry from the south, which has lately been freed of its 

 alluvial covering, exhibits the same rotundity of form, with the 

 addition of the more minute circumstances of dressing, in high 

 perfection. The space here laid bare is about ten paces by 

 three. The upper portion is nearly flat ; a great part of the 

 surface inclines rapidly to the south ; indeed, in some places, 

 it is almost perpendicular. The perpendicular face, as well as 

 the rest, is covered with furrows and dressings, indicating that 

 the grinders had been pressed against the rock by the impetu- 

 osity of the stream, independently of their gravity ; for almost 

 the whole of these dressings are horizontal, or nearly so. 

 There are some, however, which cut the rest at an angle of five 

 or six degrees, or even ten degrees. The average direction is 

 west, five degrees south *. 



No. % The second specimen is of small size, but is well cha- 

 racterised, differing in no essential point from the last. It ap- 

 pears on a space of only two or three square yards, close to the 

 road side, at the remains of an old quarry, called the Maiden 

 Craig, about two hundred yards west of Craigleith, and oppo- 

 site to the lodge of Ravelstone House. This rock, which is of 

 sandstone like the last, has also a tail, interrupted, as mentioned 

 above, very distinctly by the diluvian excavation on the west of 

 Craigleith. 



• Since this paper went to press, the valuable specimen here mentioned has 

 been almost entirely concealed by the mettle of a road thrown upon it. The 

 rock, however, remains entire, and may be cleared by any future observer. 



Vol. VII. A a No. 3. 



