Excerpt from Canadian Water Power and Its Electrical Product in Relation to Underdeveloped Resources of the Dominion With the exception of her prairie region, the rivers of Canada differ from the Mississippi, Missouri and Ohio, and the larger part of their tribu taries, in that they are not naturally navigable from their mouths, or above tidal influence to any considerable extent, except in detached sections;' while the former are navigable for thousands of miles and are therefore without water power. Those great western rivers flow upon a. Nearly uniform grade of a few inches per mile, whilst the St. Lawrence and its tributaries are interrupted by rapids, chutes and cataracts, affording a great variety, quantity and quality of water power.