GEOLOGY OF THE CAMPSIE HILLS. S7 



of forming these scratches and grooves above de- 

 scribed, had they been put in motion and impelled 

 along the surface. Upon examining some of these 

 huge masses, I found their surfaces scratched 

 and worn in such a way as to prove sufficiently 

 indicative to me, that they had been long subjec- 

 ted to attrition in water ; and I also observed, that 

 many of them presented their principal or most pro- 

 jecting angle towards the west, and sometimes to- 

 wards the north-west, which, according to my opi- 

 nion, strongly implies the direction of the current 

 which left them in the position in which they now 

 rest. It is not the object of this paper to dip 

 into the causes of this phenomenon ; but that such 

 currents as were capable of the effects which I 

 have endeavoured to describe, have flowed over the 

 surface of our globe, is to me, clearly evident, and 

 these scratches and grooves here mentioned, are 

 some of the minor, but clear proofs of its action. 

 To examine upon the great and true scale the 

 proofs of these currents having existed, we must, 

 in Scotland, enter among the Grampians ; and we 

 will there see, that the mountains of that range 

 "very generally present their most bluff and abrupt 

 sides towards the west, and the north -west points, 

 and tail and taper away towards the east and 

 south-east. 



The above observations relative to this subject, 

 may to some appear trivial and unimportant ; but 



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