'm\ 



^ 



H 



Or 



f 



iK 



re 



^^^^ II 



r I 



rr, 



t 



<« 



w 





Ni 



^^i ^1 ' 





1 



» * • 



romtlit 



""'. tile 



Jtfaili 





f. 



A 'f 



\ 



Iff 



I 



!«;. 



i'n, 



of vallev 



4 



iCfj 





h r. 



4* 



. like that i 

 fr. in all circir 



the 



.;::r beiog 



t dalbed in 

 iriiere 



.thelale^ 



f 



cs; 



i^f: 



HUTTONIAN THEORY. 



555 



Slaving arifen from the running of water, in fucli 

 a proportion as unity bears to a number infinite- 

 ly great. 



316. The courfes of many rivers retain marks 

 that they once confilled of a feries of lakes^ 

 which have been converted into dry ground, by 

 the twofold operation of filling up the bottoms, 

 and deepening the outlets. This happens, efpe- 

 ciaily, when fiicceffive terraces of gravelly and 

 flat land are found on the banks of a river, § looi 



Such platfor 

 this country, 



haiighs as they are called in 

 ways proofs of the wafte and 



L 



ferent 

 fometimes 



• produced by the riv 

 levels on which it h 



dcf 



d 



* *-*! 



run 



d us farth 



but they 



d make it cer 



that the g 



mafs of sravel which fo 



the fucceffive terraces on 



ver, was depofited in t 

 from the level of the 

 to the prefent bed of t 

 and formed of fand ai 



each fide of th 

 bafon of a lake. 



ri- 

 If 



higheft 



do 



d g 



river, all is alluvial, 

 avel, it is then evi- 



at the 



(lent, that the fpace as low as the river no' 

 mud have been once occupied by water ; 

 fame time, it is clear, that water mufi: have fi:oo 

 flowed as high at; leafi;, as the uppermofi; fu 



face of the mead 

 cile thefe two fad 



It is impoffibi 



both undeniabl 



tut by fuppofing a lake, or body of fi: 



ter, to h 



h 



occupied a great h 



(which by us mufi be held as one of the origi 



Z 



nal 



