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Petty, William, Sir. The discourse made before the Royal Society the 26. of November 1674. concerning the use of duplicate proportion in sundry important particulars : together with a new hypothesis of springing or elastique motions. By Sir William Petty, Kt. Fellow of the said Society

Espagnet, Jean d'. Enchyridion physicae restitutae; or, The summary of physicks recovered. : Wherein the true harmonie of nature is explained, and many errours of the ancient philosophers, by canons and certain demonstrations, are clearly evidenced and evinced. Written in Latine by the Duke of Espernon; and translated into English by Dr. Everard