Correspondence. 133 



sions to myself of satisfaction at Mr. Foot's style of work, in the 

 autumn of 1854, when we were all together in the neighbourhood of 

 Bantry Bay. 



There is no mention in your notice of Mr. Foot's paper " On the 

 Distribution of Plants in Burren, Co. Clare." This paper is pub- 

 lished in Vol. xxiv. of the Trans. E. I. Academy, and is accompanied 

 by a map, which shows at once the precise localities where several 

 rare and interesting plants occur, and the relation between their 

 geographical distribution and the geological structure of the district. 



When mentioning Mr. Foot's share in the production of thirteen 

 of our small memoirs called Explanations, it should have been 

 added that his name also appears as sole or joint surveyor on thirty 

 sheets of our published maps, and seven sheets of sections. 



I am happy also to say that the reading of his paper, containing 

 his botanical and geological observations on a part of Norway, will 

 not be interrupted by his death. The paper, with its illustrations 

 complete, is now in my hands, and it will have been read at a 

 meeting of the Eoyal Dublin Society before this letter can be 

 published in your next number. — I am, Sir, your obt. servant, 



J. Beete Jukes. 

 Geological Survey of Ireland, 



51, Stephen's Green, Dublin, 



^th February, 1867. 



Note. — We are requested by Mr. J. Beete Juk.es to make the following corrections 

 to his last letter which appeared in the February Number of this Magazine, p. 87. 



At line 10 from bottom of page 87, for " break in the veins," read " break in the 

 series ;" at page 88, line 4 from top, insert a full stop after "Pilton beds, etc. ; delete 

 full stop in line 5 from top, and substitute comma. — Edit. 



ON DENUDATION AND THE FOUM OF THE GROUND. 

 To the Editor of the Geological Magazine. 



Dear Sir, — Had my friend, Mr. Kinahan, bestowed equal atten- 

 tion upon the passages immediately following that which he quotes 

 from your January number, or its plates, he might, perhaps, have 

 gathered therefrom that I had not forgotten such instances as the 

 coast islands of Cork and Kerry. The inference would have been 

 more evident than that, because these islets are now acted upon by 

 the sea, isolated pillars of rock must have been formed by marine 

 denudation. Inverting the case he puts, and supposing any rain- 

 worn pinnacle depressed to form an island, it follows that this 

 situation might sometimes prove but little or nothing with regard to 

 the formation of " isolated rocky pillars " by subaerial or marine 

 denudation. 



Leaving aside elevation and depression, as remotely connected 

 with the cases in point, some of the island rocks named are of so 

 great a height (about 600 ft.), that the sea can only reach their most 

 denuded portions in the form of rain-like spray, and it will be 

 admitted that rain does sometimes occur on that coast. 



I have heard, indeed, that a water-butt was washed by storm 

 breakers from a considerable height (about 350 ft), near a lighthouse 



