112 



England, the nature and extent of the erosion accomplished by 

 the ice during its stay in the North of England, and the amount 

 of denudation that had been brought about through the action 

 of various causes since the close of the Glacial Period. Within a 

 few months of the publication of the article referred to the same 

 subjects were discussed anew in the pages of tlie Geological 

 Magazine (Dec. ii, vols, i and 2). In these latter articles the 

 chief arguments were repeated in a somewhat different form, but 

 without any substantial alteration as regards the main points of the 

 oiiginal. 



In the papers referred to several of the theories enunciated were 

 new, and were, in some respects, so different from the views then 

 generally accepted, that considerable reluctance to consider them 

 at all was manifested by the older geologists, especially by those 

 whose views on these subjects had been already committed to 

 lirint, or had otherwise been made public. Perhaps for this 

 reason, and because the acceptance of the new views involved the 

 entire abandonment of some of the views then current upon the 

 sequence of events during the Glacial Period, as well as upon the 

 important question of the antiquity of man, geologists in general 

 seem to have come, about that time, to regard some of the questions 

 involved as beyond solution, with the knowledge then available. 



By degrees, however, as our knowledge of matters pertaining to 

 the geological action of ice has extended, the older views I have 

 referred to have been, to a certain extent, abandoned, especially 

 by those geologists whose views remain unfettered ; and the place 

 of the older views has been taken by others differing only in minor 

 matters of detail from those put forward in the papers mentioned 

 above. 



Under these circumstances I have thouglit it might be convenient 

 to bring together into one article the main facts and arguments 

 already stated, as little as possible encumbered by local details, 

 and to reinforce these here and tliere with additional matter since 

 made public by the labours of other workers in the same field of 

 study. In substance, therefore, the following paper contains a 

 re-statement of the views put forward by myself in 1874. And in 



