CONTENTS. y 



weight of earth ejected from a burrow, and from all 

 the burrows within a given space — The thickness 

 of the layer of uioukl 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 th ckness — Conclusion 



Page 129-175 



CHAPTER IV. 



THE I'AUT WHICH AVORMS HAVE PLAYED IN THE 

 BUIIIAL OF ANCIENT BUILDINGS. 



The acciimnhition of rubbish on the sites of great cities 

 inde2:)endent of the action of w(»rnis — Tlio burial of 

 a Eoman villa at Abinger — The floors and walls 

 penetrated by worms — Subsidence of a modern 

 pavement — The buried pavement at Beaulieu Abbey 

 — Eoman villas at Chedworth and Brading — The 

 remains of the Eoman town at Silchester — The 

 nature of the debris by which the remains are 

 covi rt'd - The penetration of the te.ssselatei] floojs 

 and walls by womis — Subsidence of the floors — 

 'Ihickness of the mould — The old Eou)an city of 

 Wroxeter — Thickness of the mould — Depth of the 

 foundations of some of the buildings — Conclusion 



176-229 



CHAPTEE V. 



THE ACTION OF WORJfS IN THE DENUDATION OF 

 THE LAND. 



Kviience of the amount of denudation which the land 

 has undergone — Subaerial denudation — The deposi- 

 tion of dust — Vegetable mould, its dark colour a,ud 



