. Transactions and proceedings of the New Zealand Institute . dbelow the junctions of the Ida and Spottis, yet these bars appear to have hadbut a moderate influence in modifying the curve of the valley bed, as shown in the diagrammatic section.*The power of water alone couldnever have done this. Then,if it were with the aid ofmoving ice, at first blush Ianticipated that the conic sec-tion vi^ould be a parabola, forhere we would have the gravityof the ice tending downwards perpendicularly, with the flow of water tendinghorizontally. Comparing, therefore, the curve of the Manuherikia Valley, as
. Transactions and proceedings of the New Zealand Institute . dbelow the junctions of the Ida and Spottis, yet these bars appear to have hadbut a moderate influence in modifying the curve of the valley bed, as shown in the diagrammatic section.*The power of water alone couldnever have done this. Then,if it were with the aid ofmoving ice, at first blush Ianticipated that the conic sec-tion vi^ould be a parabola, forhere we would have the gravityof the ice tending downwards perpendicularly, with the flow of water tendinghorizontally. Comparing, therefore, the curve of the Manuherikia Valley, as shown byactual survey, with the parabolic one, we have VA the length of the valley,AB its rise from the exit to the source of its waters,and vc the distance of a point from v. Then VAand vc abscisses, and ab an ordinate being given, tofind CD, the other ordinate; .. v/vl : v^vc ..AB : y202,800: ^35400:: 5598: 2054. The other ordinates having been calculated inthe same manner, as given below, afford us a comparison with the )esults ofactual survey :—.
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