154 



GKEAT STONES 



Chap. III. 



but its upper surface was now on a level 

 with the surrounding turf. When the stone 

 was removed, an exact cast of its lower 

 side, forming a shallow crateriform hollow, 

 was left, the inner surface of which consisted 

 of fine black mould, excepting where the 

 more protuberant parts rested on the brick- 

 rubbish. A transverse section of this stone, 

 ogether with its bed, drawn from measure- 



A I 



Fig. 6. 



Transverse section across a large stone, which had lain on a 



grass-field for 35 years. A A, general level of the field. The 



underlying brick rubbish has not been represented. Scale 

 £ inch to one foot. 



ments made after it had been displaced, is 

 here given on a scale of ^ inch to a foot 

 (Fig. 6). The turf-covered border which 

 sloped up to the stone, consisted of fine 

 vegetable mould, in one part 7 inches in 

 thickness. This evidently consisted of worm- 

 castings, several of which had been recently 

 ejected. The whole stone had sunk in the 



