88 HEV. G. R. HALL ON 



the Mill Knock Camp. Between the southern and western faces 

 is a broad slope about six yards wide, separating between them 

 at the angle, and preventing their junction in horizontal paral- 

 lels. The five terraces cut into the southern escarpment are of 

 nearly equal length ; but a shorter ledge is again inserted, this 

 time at each end of the second from the top, measuring about 

 one-third of the whole terrace-line, or forty yards. There is 

 also a segmental break in the direct course of the lowest bank, 

 at the west end, of a similar length. The comparative rough- 

 ness of its surface, so diiferent from the smoothly-cut slopes and 

 levels of the other terraces, may denote an outburst of the free- 

 stone strata. These lines abruptly terminate, probably from the 

 same cause, at their eastern extremity in apparently artificial ex- 

 cavations. In this face also there is a decided dip of the ground 

 towards the angle ; the various heights, of the ledges, measured 

 as before, are six, ten, seven-and-a-half, seven, and five-and-a- 

 half feet. The level spaces widen as they ascend gently towards 

 the east, but about mid-way are seven, eleven, ten, and fifteen 

 yards respectively in breadth. 



WALL GROUP. 



There is an interval of four or five miles between the last 

 example and the first of the present group. Proceeding down 

 the valley to the park of Swinburne Castle, we come upon a 

 long freestone escarpment which is cut, at intervals, throughout 

 its length into two series of well-marked terrace - lines, with 

 smaller banks or ledges on the summit, running at right angles 

 away from the sloping ground. The first shelves are about two 

 hundred yards long, and curve inwards at their southern extre- 

 mity almost like seats in an amphitheatre. There are five very 

 distinct ledges, besides others in the more level space beneath, 

 two of them five feet, one three feet, another six, and the up- 

 permost ten feet high ; whilst in breadth they measure, two of 

 them ten yards, one eight, and the remaining one twelve yards. 

 These terraces are scooped out, as if artificially, at their north- 

 ern end ; and beyond them, separated by an out-crop of the 



