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HUTTONIAN xtlEORY. 



44 i 



Note xxi;. § i2 



'1 



Changes in the apparent Level of the Sea. 



387. In fpeaking of the natural epocbas mark 



'Mr 



ed out by 



phenomena of the mineral king 



dora, we have fuppofed a greater fimplicitj, and 

 reparation of effe6ls from one another, than pro- 

 bably takes place 



ice in nature. We have, for in- 

 ftance, abftraded, in fpeaking of the waile and 

 degradation of the land, from that elevation 

 which may have been carried on at the fame 

 time. This appeared neceffary to be done, in 

 order to fimplify as much as poflible the view 

 that was to be given of the whole ; but there 

 can be no doubt, that, while the land has 

 been gradually worn down by the operations 



on its furface, it has been raifed up by the ex- 

 panfive forces adling from below. There is 

 even reafon to think, that the elevation has not 

 been uniform, but has been fubjedl to a kind 

 of ofcillation, infomuch, that the continents have 

 both afcended and defcended, or have had their 



r 



level alternately raifed and deprelfed, inde- 

 pendently of all adion at the furface, and this 



within 



