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actly the solidity of a parallelopiped, if the ends are squares. But if the ends are parallelograms, the area of each is less than the square of the quarter-girt. (Euc. 27. 6.)

Timber which is tapering may be exactly measured by the rule for the frustum of a pyramid or cone (Art. 50, 68.); or, if the ends are not similar figures, by the rule for a prismoid. (Art. 55.) But for common purposes, it will be sufficient to multiply the length by the area of a section in the middle between the two ends.

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N. B. In the following table, in the last nine columns of each page, where the first or leading figures change from 9's to 0's, points or dots are introduced instead of the O's through the rest of the line, to catch the eye, and to indicate that from thence the annexed first two figures of the Logarithm in the second column stand in the next lower line.

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