2 j 6 Mr. Lliwy d to Mr. Ray. 



by the continual Rains and fubterraneous Veins of 

 Water occafion'd by them ) that lofing its Hold it 

 fell down in feveral Pieces, and in its Paffage down a 

 fteep and craggy Cliff, diflodged thoufands of other 

 Stones , whereof many were intercepted e'er they 

 came down to the Valley, but as much Came down 

 as ruin'd a faiall J?iece of Ground y and feveral Stones 

 Were fcatter'd at leaft too Yards afunder. In this 

 Accident one great Stone, the biggeft remaining 

 Piece of the broken Rock , made fuch a Trench in 

 its Defcent, as the fmall Mountain Rills commonly 

 run m\ and when it came down to the plain Ground, 

 it continued its Pafiage through a fmall Meadow, 

 and a*confiderable Brook , and lodged it felf on the 

 other fide it. From hence I gather, that all the o- 

 ther vaft Stones that lie in our mountainous Valleys, 

 have by fuch Accidents as this fallen down: Unlefe 

 perhaps we may do better to refer the greateft Part 

 of them to the univerfal Deluge; For confidering 

 there are fome thoufands of them in thefe two Val- 

 leys [otLhanherys and Nant-Phrancon] whereof (for 

 what I can learn) there are but two or three that 

 have fallen in the Memory of any Man now livings 

 in the ordinary Courfe of Nature we fhall be com- 

 pelled to allow the reft many thoufands of Years 

 more th*n the Age of the World. But I have 

 fceen too tedious in things that are no information to 

 you, for which I rauft beg your pardon •> tho' I can- 

 not forbear to add two other particulars, which 

 feem'd very fingular. Firft. At the higheft Parts of 

 the Glyder, ( a Mountain about the height of Cadet 

 Idris) there are prodigious heaps of Stones , many of 

 them of the largenefs of thofe of Stonehenge^ but of 

 all the irregular Shapes imaginable, and they all lie 

 in as much Confufion as the Ruins of a Building can 

 be fuppofed to do. Now I mull confefs I cannot 

 well imagine how this has happened , for that ever 

 they fhould be indeed the ruincs of fome Edifice , I 



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