Chap. III. UNDERMINED BY WORMS. 151 



side, forming a shallow crateriform hollow, 

 was left^ the inner surface of which consisted 

 of fine hlack mould, excepting where the 

 more protuberant parts rested on the brick- 

 tubbish. A transverse section of this stone, 

 together with its bed, drawn from measure- 

 m.ents made after it had been displaced, is 

 here given on a scale of J inch to a foot 

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



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 

 i inch to one foot. 



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 

 thirty-five years, as far as I could judge, 



about 1 J inch ; and this must have been due 

 11 



