B8^ 



iLLtJSTRATIONS OF THE 



th 



what we may perhaps exped to be 



complilhed, by the progrefs of geological fcience 



and the 



plying of 



obfervations 



It has been fuppofed, that the Pyrenees dimi 

 nifli about ten inches in a century ; but what 

 confidence is to be 

 unable to determine . 



A very unequivocal mark of the degradat 



put in this eftimate, I 



of 



is 



fte 



to be met 



ith 



in the 

 Thefe 



heaps of loofe (tones found on their tops, 

 ftones, it is obvious, cannot have come from any 

 other place by natural means, and they are ac- 

 cordingly always fharp and angular, and have 



none 



f th 



charade 



s of tranfported rocks; 

 They are faid fometimes to have been brought 

 by men's hands ; but this is highly improbable, 

 theirquantity is often fo confiderable,and the dif- 

 ficulty of tranfportation fo great. Where any pur- 

 pofe was to be ferved by heaping them together, 

 men have availed themfelves of the flones tiiat 

 they found ready prepared on the fummit, and 

 have conftruded from them cairns, which have 

 ferved as fignals, ufeful in their paftoral, ai 

 fometimes in their military occupations. 



d 



Note 



« 



ElTai fur le Mineralogie des Pyrenees, p. 87, 



