Chap. III. UNDERMINED BY WORMS. 151 



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, 

 together with its bed, drawn from measure- 

 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 



"Vfci : ; tift . 



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. 



sloped up to the stone, consisted of fine 

 vegetable mould, in one part 7 inches in 

 thickness. This evidently consisted of worm- 



it 



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^ inch; and this must have been due 



