^66 



ILLUSTRATIONS OF TH£ 



which hypothetical reafonings are warranted by 

 the ftrideft rules of philofophical invefligation. 



It is propofed 



fe 



here the caufes vifi 



b 



to man feem inadequate to 



ffed, and 



her 



gent th 



we 



ft therefore have recourfe 



IS 



fibl 



bed to this agent are 

 gy of nature. 



it is 



If the operations afcri 

 onformable to the analo 

 that can in reafon be re 



** 



q 



7. Another circumflance may alfo influen 



the generation and prefervation of lake 



but 



IS 



alfo 



one 



th 



hich we are b 



little 



ac- 



Th 



ft 



\ 



quainted. 



body of mineral fubft 



d indeed the whole 

 es which forms the 



bafis of our land, have been raifed up from the 

 bottom of the fea, by a progrefs that ftiould feem 

 in general to have been gradual and flow. Ap- 

 pearances, however, are not wanting, which 

 fliew, that this progrefs is not uniform ; and 

 that both rifing and finking in the furface 



the 



are 



of the land, or in the rocks which 

 bafe of it, have happened within a period of 

 time, which is by no means of great extent. 

 In this progrefs, the elevations and depreflions 

 may not be the fame for every fpot. They may 

 be partial, and one part of a ftratum, or body 

 of ftrata, may rife to a greater height, or be 

 more depreiTed, than another. It is not impof- 

 lible, that this procefs may affed the depth of 



lakes 



? 



