480 Correspondence — Rev. H. G. Bay — Prof. Jones — Mr. Cragor. 



EEV. H. G. DAY'S REPLY TO MR. A. F. GRIFFITH. 



Sir, — A Mr. A. F, Griffith in your August Number comments on 

 my matliematics. 



I certainly plead guilty to a single inaccuracy, whicli did not 

 affect the principle : Mr. Griffith was hardly justified in accusing 

 me of " singular inaccuracy." 



I i-egret that he should fail to recognize that, if a figure A is the 

 shadow of B, B would also be the shadow of A. Also that he 

 should so completely endorse Mr. Fisher's original formulee, some of 

 which contradict our previous ideas. An example will suffice : — 

 " It appears that no apparent obliquity of trend can be given by a 

 vertical section, e.g. by a vertical cliff! " p. 21. 



It is superfluous either to criticize work that leads to such an 

 anomaly, or to defend oneself against such an assailant. I leave the 

 public to judge between us. H. G. Day. 



CERVUS MEGACEROS IN BERKSHIRE. 

 Stk, — Further particulars about the antlers mentioned at page 95 

 of the Geological Magazine for February last having come to 

 hand, I learn that they were found in the Peat at Ufton, near 

 Aldermaston, in the Kennet Valley, when the peat was being dug 

 for Mr. Congreve, the owner of the Aldermaston Estate, about 

 forty years ago. Thomas Benham, living at Tatley, and aged 72, 

 had the specimens direct from Aldermaston House, and the informa- 

 tion from the man who found them ; and he says that the marl below 

 the peat not being dug into, when they raised the peat there for the 

 purpose of burning it for ashes, the horns came from the peat itself. 

 For notices of the Kennet Peat and its contents, and the manufacture 

 and use of peat-ashes, see the " Transact, of the Newbury District 

 Field-club," vol. ii. 1878, pages 5, 123, 130, 141, 156, etc. 



Aug. 31, 1881. T. KUPEKT JONES. 



ROCK-BASINS ON GRANITE TORS IN CORNWALL. 



SiK, — I would wish to know your opinion respecting the origin of 

 the numerous rock-basins which occur on our granite tors in pro- 

 fusion, and were first noticed by Borlase in his " Antiquities of Corn- 

 wall." 



They occur also in Wales, I believe, (vide Leland's Itin., vol. v. 

 p. 59), and it would be interesting to know — in opposition to the 

 Druid theory — whether these circular impressions, averaging in 

 Cornwall about two feet in diameter, are concomitants of granite 

 mountain tops the world over. 



Borlase assigned them a Druidical origin, believing them to be 

 almost peculiar to Cornioall ; and that they do not occur on every 

 granite eminence I know from actual experience in other lands. For 

 instance, granite peaks of Alleghanies. 



Thomas Cragor, F.E.G.S. 



Woodbury, Truro, Sept. 14, 1881. 



