1871.] 



LOGIIf NOETH-IKDIAN GEOLOGICAL CHANGES. 



451 



3. MEMOiiA.]srDA on the most recent Geological Changes of the RrvERS 

 and Plains of Noetherk India, founded on acciteate SuEVErs 

 and the Aetesian well-boeing at Umballa, to show the practical 

 application of Mr. Login's Theoet of the abrading and trans- 

 porting power of water to effect such changes. By T. Login, Esq., 

 F.R.S.E. 



(Communicated by Alfred Tyler, Esq., F.a.S.) 



[The publication of this paper is deferred.] 



(Abstract.) 



The author commenced by referring to the general conditions of 

 the surface of the country under consideration, and to the evidence 

 afforded by it of a great decrease in the amount of rainfall, and a 

 great change in the nature of the rivers. His object was to show 

 that the superficial deposits of the plains of India were formed by 

 the action of mountaiu-streams, the deposits being irregular trans- 

 versely, but exhibiting a uniform section longitudinally, in a curve 

 which the author believed to be a true parabola, as indicated by 

 Mr. Tylor. The connexion of this with the author's theory as to 

 the transporting power of water was indicated. The author also 

 showed that the beds of the large Indian rivers are rising rather 

 than being lowered, and pointed out that this was in accordance 

 with his theory. 



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