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HUTTONIAN THEORY. 



^0 



345 



% 



farface 



the 



th fid 



f the 



d 



O 



5nn; 



^loet 



g from one end of 



y 



\ 



•u 





6ls. even 



f th 



ntf, 



foin 





deed, many great tr: 



parts of the Pyrenees, contain no granite wha 



foever ; and not a few of the higheft mountai 

 conlift entirely of caL 



In- 



tral 



fchift 



A larg 



""'•-.fit, 



deduft 



fliould be made from the frad: 



of 



fiibft 



V 



fro 



the 



(Irua 



o 



f 



ch 



are 



hich, 

 often 



to the 





founded wiih the granitic trad 



"■-.„ 

 * 'tic Kic^p* 



3 



I mip;ht 



add other eftimations of the 



nt 



-alafl 



rooi iEK 





J 



*i- 



I 



fame kind, all confefTedlj rude and imper- 

 fed, but flili cpnveying, by means of num- 

 bers, a better idea of the limit to which our 



i 



knowledge approximates^^ than could be done 

 fimply by words ; and, on the whole, it would 

 appear, that if we ftate the proportion of gra- 

 nite to fchidus to be that of one to four, we 

 ■ Crinifei? fhall certainly do no injuftice to the extent of 



on 



i\ ^. PA' 



: ,t IS t:: !: 



.'; km 



rf 



.1 



I 



r 



a rough 



eflimate from 





|he former. 



r 



It remains to form 

 maps, and from the accounts of travellers, of 

 what; proportion of the earth's furface confiils of 

 primary, and what of fecondary rocks. After 





fr«f" 



t- 



-Iirifl 



'n of t^^ 



H" 



/ 



i^ 



fupplying the want of accurate raeafurement by 

 what appeared to me the mofl: probable fuppo- 

 fitions, 1 have found, that about -V of the fur- 

 face of the old continent may be conceived to 

 be occupied by primitive mountains ; of which, 



if 



'1 



