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HUTTONIAN THEORY. 



359 



united to that of BslTenthwa te, and occupied 

 the whole valley from Borrowdale to Oufe- 

 Bridge. Thefe two lakes are at prefent joined 

 only by a ftreani, which runs from the former 

 into the latter, and their continuity is inter- 

 rupted by a confiderable piece of alluvial land, 

 compofed of beds of earth and gravel, without 

 rock, or any appearance of the native ftrata. 



"^^^°bec5|, This feparation, .herefore, feeras no other than 



a bar, formed by the influx of twt rivers, 

 that enter the valley here from oppofite fides, 

 the Greata from the eaft, ana Newland's Wa- 

 ter from the weft. The fur face of this mea- 

 dow is at prefent twelve or fif een feet at leafl 

 above the level of either lake ; and a quantity of 

 water of that depth muft therefore have been 

 drawn off by the deepening of the iiTue at 

 Oufe-Bridge, through which the w^ater of both 

 lakes pafTes, in its way to the ocean. 



Many 



a 



pies, fimilar to this, may be 



fam 



lakes 



there are in- 



iii this b 



colledled from the 



deed few places froi 



geology, more information may be colied:ed, 



321. The larger lakes exemplify the fame pr 

 grefs. Where the Rhone enters the Lake of G 



f 



the beach has b 



f 



'.> 



obferved 



annual iocreafe ; and the Portiis Valefias, now Pre- 

 vallais, which is at prefent half a league from the 

 lake, was formerly clofe upon its bank. Indeed, 

 the fediments of the Rhone .ippear clearly to 



Z4 



have 



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