HOMB VIII. KOLLANITE. 109 



is worth observing, that pebbles of this kind are 

 met with in almost every part of England. I 

 have collected them from very different points 

 along the course of the North Road, both on the 

 eastern and western side of the island : from 

 Nottingham, York, Durham, Edinburgh, Lan- 

 ark, Carlisle, Chester, Shrewsbury, and Wor- 

 cester; and have observed them in many other 

 parts. 



" The gravel met with immediately round 

 Oxford consists principally of small siliceous 

 pebbles ; many of which are flint, mixed with 

 worn fragments of fossil calcareous shells, and 

 brown iron-stone ; the presence of all these 

 substances is accounted for by the nature of the 

 surrounding country; the limestone of that dis- 

 trict abounding with fossil shells, and many of 

 the neighbouring hills consisting either of chalk 

 containing flint, or of ferruginous sand contain- 

 ing brown coarse iron-stone." 



But it is time to return from the consideration 

 of the pebbles, to that of the rock under view, 

 which has also been called a pebble-stone by 

 some authors. 



That there may be no suspicion of national 

 prejudice, in the account of this singular rock 

 (which not only surpasses most others in beauty 



