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I is well-known as a fundamental principle in statics, that " Two pressures, represented in direction and quantity by " two adjoining sides of a parallelogram, are equivalent to one " represented in direction and quantity by the diagonal " which passes through the point at which these sides meet." A demonstration of this proposition, that shall be at once sufficiently concise, and sufficiently elementary, to admit of its being with propriety introduced into a course of academical instruction, has been hitherto, so far as I know, a desideratum. The following may perhaps be found to possess that advan-r

XII. Elementary Demonstration of the Composition of Pressures