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That a comparative view of the weights of equal volumes of water and all other substances is highly useful on many occasions, is too well known to require any proof; but that a principal use resulting from this comparison, when properly made, is unattainable by a perusal of the common tables, I shall here endeavour to shew, and at the same time point out a remedy for this defect. One capital advantage derivable from a table of specific gravities, is the knowledge of the absolute weight of any solid measure of the substances therein contained, or that of the solid measure of a given weight of those substances, a cubic foot of water being supposed to weigh 1000 ounces avoirdupois, and consequently a cubic inch of water weighing 253, 182 grains.

XIII. Remarks on specific gravities taken at different degrees of heat, and an easy method of reducing them to a common standard