Chap. IV. OF ANCIENT BUILDINGS. 223 



Measurements by Dr. H. Johnson of the thickness of 



THE VEGETABLE MOULD OVER THE ROMAN RU1STS AT 



Wroxetek. 



Trenches dug in afield called "Old Works." 



Thickness 



of mould in 



inches. 



1. At a depth of 36 inches undisturbed sand was 



reached .. .. .. .. .. 20 



2. At a depth of 33 inches concrete was reached 21 



3. 9 inches concrete was reached 9 



Trenches dug in a field called "Shop 

 "Leasows ;" this is the highest field within the 

 old walls, and slopes down from a sub-central 

 point on all sides at ahout an angle of 2. 



I hickness 



f mould in 



inches. 



4. Summit of field, trench 45 inches deep .. 40 



5. Close to summit of field, trend) 36 inches deep 26 



6. trench 28 inches deep 28 



7. Near summit of field, trench 36 inches deep 24 



8. trench at one end 89 

 inches deep ; the mould here graduated into 

 the underlying undisturbed sand, and its 

 thickness is somewhat arbitrary. At the 

 other end of the trench, a causeway was en- 

 countered at a depth of only 7 inches, and 



the mould was here only 7 inches thick .. 24 



9. Trench close to the last, 28 inches in depth, .. 1;'> 



10 Lower part of same fleld^trench 30 inches deep 15 



11 ,, trench 31 inches deep 17 

 12, t'ench 36 inches deep, 



at u Inch depth undisturbed sand was reached 28 



