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IV. On the Revolutions of the Earttis Surface. By Sir James 

 Hall, Bart. Pr. R. S. Ed. & F.R.S. Lond. 



PART L 



[Head March 16. 1812.] 



WE are never more disposed to give credit to a philoso- 

 phical system, than when we meet with a case of its 

 successful application, unknown to the author, or containing 

 circumstances which he had not taken into account when he 

 formed that system. 



The facts brought forward in the following paper, which, 

 according to my view of the subject, clearly indicate the 

 operation of immense torrents, can be accounted for, I think, 

 in a very satisfactory manner, by the Huttonian Theory, and 

 consequently afford some very powerful arguments in support 

 of it. 



But such was by no means the view taken of this subject by 

 JDr Hutton himself, or by Mr Playfair, who, since his death, 



S2 has 



