Chap. III. BROUGHT UP BY WORMS. 



133 



thick. This layer did not contain fragments 

 of any kind ; but beneath it there was a layer 

 of mould, 1^ inch in thickness, full of fragments 



.111, A 



Fig. 5. 



Section, reduced to half the natural scale, of the vegetable mould 

 in a field, drained and reclaimed fifteen years previously ; A, 

 turf; B, vegetable mould without any stones; C, mould with 

 fragments of burnt marl, coal-cinders and quartz pebbles; 

 D, sub-soil of black, peaty sand with quartz pebbles. 



of burnt marl, conspicuous from their red 

 colour, one of which near the bottom was an 



