288 Correspondence — Mr. J. M. Wilson. 



In conclusion, if H. B. W. should ever visit Bristol, I shall be 

 happy to show him my Potamides, and elicit his opinion. 



7, King Square, Bristol. W. W. Stoddart. 



EUGBT SCHOOL NATUEAL HISTOEY SOCIETY. 



Sir, — In your kind notice of the Eugby School Natural History- 

 Society's Eeports, there are one or two errors of some importance. 

 Will you allow me to correct them? A quotation is made from a 

 report very much out of date, and it is made to appear as if appli- 

 cable to the present system. As it is, very nearly the whole school, 

 and not one-tenth only, are at work at Natural Science, and have been 

 so for five years. The central study is Chemistry, this is connected 

 on the one side with Natural History, of which Botany and Geology 

 are selected as types ; and on the other side with Physics, that is, 

 with us, with mechanics, and heat, and electricity. 



Many of your readers would be interested, I think, in seeing how 

 laborious young observers are in botany, and how much is found to 

 provide them with original work. 



I must disclaim the honour of being President. This post is most 

 worthily filled by Mr. Kitchener, M.A., P.L.S., to whom the Society 

 is greatly indebted. James M, Wilson. 



Eugby, Maij 8, 1869. 



P.S. — One of my young geologists, Mr. H. C. Cholmondeley, tells 

 us of a singular subsidence at Marton, near Northwich, on Lord 

 Delawarr's property. About twelve years ago a circular area, sixty 

 yards across, suddenly sank down, to a depth, as I understand, of a 

 few yards. Two years ago a fresh subsidence took place, sufficient 

 to submerge a poplar tree, which remained standing in the circular 

 lake so formed. Last term the ground again sank, and the sinking 

 was accompanied with much noise, and violent movement of the 

 water. The water was cold. It is four miles to the nearest salt 

 mine, and three to the nearest brine works. He is unable to assign 

 any cause for the phenomena. Perhaps some of your Cheshire cor- 

 respondents can enlighten us. — J.M.W. 



THE GEAVELS OF LOPHAM FOED; 



Sir, — I think it important that the phenomena at Lopham Ford 

 should be fully discussed, on account of the light they are calculated 

 to throw upon denudation. I am glad, therefore, that my esteemed 

 friend has not allowed my reply to his query to pass without 

 remark, for I hope the question he raises may induce Geologists 

 to go and see for themselves and report to you. I should not have 

 referred again to the subject, because I have said my say, and stand 

 by my opinion. But Mr. S. V. Wood, jun., has kindly and spon- 

 taneously written to me, to tell me that he visited the spot with Mr. 

 Harmer, while they were engaged in mapping the glacial deposits, 

 and that he agrees with me that the gravel south of Lopham Ford 

 is Middle Drift, and not a river-gravel. 0. Pisher. 



'P.S.— Erratum at p. 552, line 42, vol. v. 1868, for "Boulder-clay" 

 read " London clay." O.F. 



