34^ 



ILLUSTRATIONS OF THE 



if we take one-fifth, we have 



^•- for the 



part 



of the furface occupied by granite rocks, which 

 differs not greatly from the leaft of the two H- 

 mits afligned by Dr Hutton. 



311. In eflimating the granite of Scotland, 

 Dr Hutton has certainly erred confiderably in 

 defed^', and Mr Kirwan, who always differs 

 from him, is here neareft the truth ; though he 

 is right purely by accident, as the information 

 on which he proceeds is vague and erroneous. 



The places in Scotland where granite is 

 found, are very well known ; but the extent 

 of fome of the mofl confiderable of them is 

 not accurately afcertained. In the fouthern 

 parts, except the granite of Galloway, which 

 is found in two pretty large infulated trads, 

 there is no other of any magnitude. The grar 

 I of the north extends over a large di- 

 ftrid:. If we fuppofe a line to be drawn, from 



a few miles fouth of 4-berdeen to a few miles 



fouth 



nit 



? 



^r 



^' Dr Hutton in this cafe no doubt made a verj loofe 



eftimate. H 



:S 



not perhaps occupy 



more 



part of the whole furface* 



The 



whole furface of Scotland is not much 



geographical miles, the 5©odth part of which is exadl/ 

 46 i and this is exceeded by the granite in Kirkcud- 



htfli 



as may b 



from 



faid 



283 



