Extracts of Three Letters; One, Lately written by Monsieur De Bills, Touching the True Use of the Lymphatick Vessels; The Second, written by Mr. Stafford from the Bermudas, Concerning Tydes, Whales, Spermaceti, Strange Spiders-Webbs; Some Vegetables, and the Longevity of the Inhabitants of That Island; The Third, Written from Paris, about the Polishing of Telescopical Glasses by a Turn-Lathe; As Also the Making of an Extraordinary Burning-Glass at Milan