3. Memoranda on the most recent Geological Changes of the Rivers and Plains of Northern India, founded on accurate Surveys and the Artesian well-boring at Umballa, to show the practical application of Mr. Login's Theory of the abrading and transporting power of water to effect such changes. By T. Login, Esq., F.R.S.E.
(Communicated by Alfred Tylor, Esq., F.G.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 mountain-streams, the deposits being irregular transversely, 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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