REV. E. HILL ON WKLLS IN WEST SUFFOLK BOULDEK-CLAY. 589 



their singular contortions as affording some of the strongest 

 ]>roofa of ghicier-action, and thougli ho admitted tliat the lioulder- 

 clay still presented many unsolved difficulties, ho had never seen 

 what he could regard as a valid argument against the view that the 

 true typical Boulder-clay is essentially a product of land-ice. 



The Author, in answer to Prof. Prestwich, said that he had 

 taken into account the variations in surface-level of si)ots where 

 wells existed. Dr. Evans's instances of permeability in Boulder- 

 clay were a valuable corroboration. The appearances of sections 

 did not to himself suggest an origin such as erosion by subglacial 

 streams. He would be very glad to study the sections at Saffron 

 AValden and those in the Eden Valley described by Mr. Goodchild. 

 ][e was not aware of any case in which a " ground-moraine " had 

 been seen in actual process of formation, but he imagined that any 

 structures possessed by a mass so formed would be horizontal in 

 tlieir general direction. The appearances described in the paper 

 were nofr of that character. 



