Correspondence — P. F. Kendall. 237 



indicates that there had been no glaciation at that locality. My 

 observations agree with the generally accepted view that the hills 

 of this district have not been covered by a general ice-sheet, and that 

 the only extraneous ice in this part of the Aire Valley lay on its floor." 



This is surely explicit — no boulder clay, no erratics (limestone here 

 would be errittic), none but rock weathered in situ. 



The allusion to the quarry at Eldwick is one of the author's most 

 unfortunate touches. Messrs. Jowett and Jfaufe, two geologists 

 who have achieved distinction by glacial work in other areas, show 

 in their paper previously quoted by me that between this spot aud 

 the narrow crest of the moor there are six noteworthy lake-channels, 

 two striated surfaces, one being at 1,080 feet O.D. While their 

 map shows the ice-margin at a little above 1,200 feet O.D. This 

 quarry, therefore, was covered by more than 600 feet of ice 1 



True, Professor Gregory was familiar only with the title of the 

 paper until my criticism brought it to his notice, but as it ''was 

 entitled ' The Glaciation of the Bradford and Keighley District ', I 

 did not expect to find any account of the Delves in it ". Seeing that 

 Professor Gregory dealt also with the Drift mounds at Bingley 

 which is midway between the two towns named, it is surprising, that 

 he did not refer to it for that purpose; indeed, there is something 

 humorous in the thought of Professor Gregory's profound 

 research into the meaning of the word " Delves " with the 

 aid of Wright's English Dialect Dictionary and the I^ew English 

 Dictionarij, while neglecting this important paper. 



As to this word Delf, every map of the district on the 6 in. or 

 1 in. scale would furnish examples of its comuTon colloquial use, not 

 in those rare and recondite senses disinterred by Professor Grecory. 

 We have the following : " Coopers Cross Delf (Disused)," " Dry Beck 

 Delph (Disused)," " Derry Hill Delph," " Odda Delph (disiised)," 

 in each case with hachuring to indicate a quarry, the common meaning 

 of the word. 



Now as to the occurrence of limestone erratics. Professor Gregory 

 never mentioned them in his paper, and the whole context ascribes 

 the Delves and their contents to tiie Millstone Grit, including the 

 black chert ; moreover, he says specifically that he saw no 

 " erratics ", and the whole case for his corrie glacier depends upon the 

 Delves being beyond and above the general glaciation. Now he 

 informs us that he did not say or conclude that there was no lime- 

 stone in the Delves. Neither did he say there was no Shap granite 

 there. In fact, he told us what he did find, and not what he did not. 

 He now suggests that any digging iji the Delves may have been 

 to obtain limestone from underlying boulder clay — a material he 

 was unable to find and clearly considered to be absent. This is not 

 the scientific method, but the methods of the special pleader in the 

 leading case of the borrowed bucket. 



As it is many years since I went over the Delves, I walked the 

 length of them yesterday. I found the lime-kilns much less com- 



