GLACIERS OF CHAMOUNY. 385 



tiie Drin Mountain to the great forest of Brecon . ad. A coTner Mineral bason 

 of ground from Blaen Romney to the north of Brynoer. 3d.>" SouthWales. 

 Another spot;, from Rhyd Ebbw and Beaufort Iron Works, 

 through LI wyn y PwU, near Tavern Mafed Snr, to where it 

 joins Lord Abergavenny's mineral property. 



17. Note. A principal fault is observable at Cribbath 

 where the beds or strata of the limestone stand erect : another, 

 of considerable magnitude, lies between Ystradvellte, and 

 Penderryn, where all the strata on the north side of the bason 

 are moved many hundred yards southward (as at Dinas, ) 



t8. Note. The limestone appears to the surface all along the 

 boundary line in the counties of Monmouth, Glamorgan, Car- 

 nlarthen, Brecon, and no doubt can be entertained of its due 

 range from Newton across Swansey Bay to the Mumbles, and 

 from Llanmaddock Hill across Carmarthen Bay to Tenby. In 

 Pembrokeshire it appears to the surface on the south side of 

 the bason, at Tenby, Ivy Tower, Cockelard, Bit, Church- 

 Williamston, Lawrinny, Cord, Canta, and Johnston, and on 

 the north side of the bason, at Templeton, Picton, Harriston 

 and Persfield ; yet it certainly forms an underground con- 

 nection from point to point. 



IX. 



On the Water Pits of the Glaciers of Chamouni/. By a Cor 

 respondent. 



To Mr. NICHOLSON, 

 SIR, 



Cork, 13th April, 1807. 



I 



JUST now was looking over a paper from Count Rumford, Observations 



in your Journal, on a curious phenomenon on the " Glaciers of" * ^^^^ °'*" 



•L ,,1 . , . , , served by 



" Chamouny, with respect to a pit which he observes was Count Rum- 

 formed in the ice. The manner in which he accounts for it, is,^*^'"'*' 

 I think, inconsistent with his own rules. The manner in which 

 I would account for this phenomenon, is, that as cold water 

 Vol, XVI,— May, 1807- Gg lying 



