394 



ILLUSTRATIONS OF THS 



with a bay of the fea intervening. Its d 

 lions are not far from thofe of the pie\ 



gout 6 



I 



feme former ilate of the g 



mountains in that ifland, the declivity from the 

 top of Goatfield may have been very uniform, 

 and more rapid than it is at prefent. 



353. Befides glaciers and torrents, which have 

 no doubt been the principal inftruments in produ- 



cing 



thefe 



hang 



other 



may h 



hen 



once 



cafionally operated. Large ftones, v 

 detached, and refting on an inclined plane, from 



\ 



the effeds of wade and decompofition, may ad- 

 vance horizontally, at the fame time that they 



and this will happen 



defcend perpendicularly, ai 

 though they be not urged by any 

 thing but their own weight 



for the furface o£ 



the 



der th 

 than a' 



ground, as it 



ftes, remains higher un~ 



flone, and for a little way round it, 

 a greater diftance, on account of the 



protedtion 



hich it receives from th 



flone 



as in 



th 



fiances at Sal 



juft mention 



ed 



The flone itfelf alfo becom 



the bottom: and thus the furface in c 



ded at 

 ontact 



with the ground is 

 the two furfaces 



diminiflied in extent, and 



one another 



It 



th 



fupp 



endered convex 

 fl therefore happ 

 jally weakening 



wards 

 , that 

 ill at 



length give way, and the flo 



ard the low 



fid 



and 



incline or roll 

 ay even roll con- 



fiderably,, 



