STEWART, Matthew.

Tracts Physical and Mathematical. Containing, An Explication of Several Important Points in Physical Astronomy; and, A New Method of ascertaining the Sun's Distance from the Earth, by the Theory of Gravity.

19 folding engraved plates. vii, [1], 411 pp. Thick 8vo, cont. speckled calf (very skillfully rebacked), orig. red morocco lettering piece on spine. Edinburgh: A. Millar & J. Nourse, 1761. First edition. Stewart (1717-85), was the successor to Colin Maclaurin in the chair of mathematics at Edinburgh and established his reputation as a mathematician by the publication of his General Theorems (1746). "After his election to the chair [in 1746], Stewart's interests turned to astronomy and natural philosophy; and he displayed great ingenuity in devising purely geometrical proofs of results in these subjects that had previously been established by the use of algebraic and analytical methods. Examples of this kind are to be seen in [the present book]."­D.S.B., XIII, p. 54. Fine copy with the stamp of the Royal Society of Edinburgh on title.

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