PETTY, Sir William (1623-1687). A Discourse made before the Royal Society the 26th of November 1674. Concerning the use of Duplicate Proportion in Sundry Particulars: together with a New Hypothesis of Springing or Elastique Motions. London: John Martyn, 1674.

細節
PETTY, Sir William (1623-1687). A Discourse made before the Royal Society the 26th of November 1674. Concerning the use of Duplicate Proportion in Sundry Particulars: together with a New Hypothesis of Springing or Elastique Motions. London: John Martyn, 1674.

12° (130 x 75mm). Ornamental initials. (First two leaves trimmed at margins.) Early paper wrappers, marbled edges (spine chipped), brown morocco-backed case. Provenance: John Aubrey (1626-1697), presented by the author, inscription on title verso.

PRESENTATION COPY to Petty's friend, fellow member of the Royal Society, and biographer, John Aubrey. Aubrey's is one of the best contemporary accounts we have of Petty, whom he called his "singular friend". An avid antiquary who was responsible for bringing public notice to the megalithic ruins at Avebury, Aubrey counted among his friends not only Petty but Hobbes, Ashmole and Anthony à Wood; he was obliged to sell part of his library in 1677.

Petty has been called the "father of modern economics" (Keynes vii). In this discourse delivered to the Royal Society, Petty "emphasizes the utility of scientific investigation rather than its more philosophical aspects" (Keynes p.15), applying the laws of motion and weight to human activity. Keynes, Petty Bibliography, 16.