100 Professor P. F. Kendall— The English EsJcers. 



stones as Russell pointed out are scattered around, and line many 

 of the hollows. The " triple ridge " is where the Delves form a 

 double row. Small limestone boulders beneath the notice of the 

 lime-burners can readily be found, though not by Professor Gregory, 

 in spite of the clear guidance of all his precursors. Even lacking 

 these, however, the black chert, wholly dissimilar in form, size, and 

 structure to the little pellets of chert in the Millstone Grit, should 

 have warned him off so extravagant a blunder as to put the ice on the 

 wrong side of the moraine — an error of which he was guilty in his 

 memoir on the Irish Eskers, and perpetrates again in regard to 

 the Roman Ridge at Lindrick (not Lendrick), near Ripon. 



Such a series of blunders, errors of observation, errors of interpreta- 

 tion, should, I think, make every geologist hesitate to accept 

 Professor Gregory's judgment upon any question in Glacial Geology 

 at least. 



I have on a previous occasion had to call attention to Professor 

 Gregory's mis-use of quotation — here we have his inaccuracy 

 illustrated in another form : he pronounces his preference for the 

 description by Carvill Lewis over that by Green (meaning Russell), 

 yet he shows himself ignorant of the most vital and significant facts 

 in the record. When did Professor Gregory read these documents, 

 and why has he made no use of their contents ? Are the references 

 to them mere embellishments ? These are questions that naturally 

 arise. I make no comment upon the discussion upon the " Low- 

 level Kames of the Aire Valley ", merely remarking that anyone 

 who desires to obtain a clear and comprehensive account of the 

 Glacial phenomena of the district with maps of the moraines, and 

 evidence of the moraine-like phenomena, will find it in the paper by 

 Jowett and Mufi already quoted, but they will not find it in Professor 

 Gregory's paper. 



I turn to another section, namely, that on " Eskers in North 

 Yorkshire and near York", with some reluctance, as my object is 

 not to vindicate my own work but to criticize Professor Gregory's, 

 and to enforce the warning that his peculiar methods in the field 

 and in the study do not conduce to a correct apprehension of the 

 problems. The phenomena to be explained are the two great 

 crescentic ridges of drift, about 4 or 5 miles apart, which span the 

 Vale of York in fairly close parallelism, the City of York standing 

 about the middle of the northern arc. 



The first suggestion that these were the terminal moraines of 

 a great glacier appears to have been made by Dakyns,^ though his 

 meaning is not clearly expressed, but Carvill Lewis gave un- 

 ambiguous expression to this view at the Manchester meeting of the 

 British Association in 1887, from which occasion I date my interest 

 in Glacial Geology. 



Already in 1881 Mr. J. E. Clark (the J. F. Clark of Professor 

 Gregory) had given a most valuable and careful account of the 

 1 Q.J.G.S., xxviii, p. 387. 



