564 PLA.TEAF-GKAVELS OF EAST BERKS AND WEST SUEEEY. 



The Author, in reply, stated, with reference to the contortions, 

 that the cases cited by Mr. Monckton hardly bore on the question, as 

 they occurred much lower down the Thames valley, and at lower 

 altitudes. The main point on which he differed from Prof. Prestwich 

 was that he could not accept his later Pliocene date as fixing the 

 minimum time. The term " Boulder-clay " was used only in a 

 descriptive sense. He thought that one of the speakers had not 

 given attention to all the facts brought forward. 



