CONTENTS. V 



weight of earth ejected from a burrow, and from all 

 the burrows within a given space — The thickness 

 4jf the layer of mould which the castings on a given 

 space would form within a given time if uniformly 

 spread out — The slow rate at which mould can 

 increase to a great thickness — Conclusion 



Page 129-175 



CHAPTER IV. 



THE riJlT WHICH WORMS HAVE PLAYED IN THE 

 EtMlIAL OF ANCIENT BUILDINGS. 



The accumulation of rubbish on the sites of great cities 

 independent of the action of worms — Tho burial of 

 a Boman villa at Abinger — The floors and walls 

 penetrated by worms — Subsidence of a modern 

 pavement — The buried pavement at Beaulieu Abbey 

 — Boman villas at Ched worth and Brading — The 

 remains of the Boman town at Silchester — Tho 

 nature of the debris by which the remains are 

 covered — The penetration of the tesselated floors 

 and walls by worms — Subsidence of the floors — 

 I'hickness of the mould — The old Boman city of 

 Wroxeter — Thickness of the mould — ^Depth of the 

 foundations uf some of the buildings — Conclubion 



176-229 



CHAPTER V. 



THE ACTION OF WOKHS IN THE DENUDATION OF 

 THE LAND. 



Evidence of the amount of denudation which the SAod 

 Las undergone — Subaerial denudation: — The deposi- 

 tion of dust — ^Vegetable mould, its dark coloar auc> 



