(789)
Numb. 40.
PHILOSOPHICAL
TRANSACTIONS.
Monday, Octob, 19. 1668.
The Contents.
The Variations of the Magnetick Needle, predicted for many years following.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.A Note concerning Empty Tubes formerly describ'd.Observations concerning Cochineel, accompanied with some Suggestions for finding and preparing such like substances out of other Vegetables.Queries concerning Vegetation, especially the Motion of the Juyces of Vegetables.Other Queries about the Use and Culture of the Kitchin-garden and Winter-greens.A Suggestion for taking more notice, than hitherto hath been done, of the Juyces of Trees, by Tapping.An Extract of a Letter from Dr. Nathanael Fairfax, about a Leaden Bullet voided by Urine.An Account of some Books:I. J. Hevelii COMETOGRAPHIA.II. Renati Des Cartes EPISTOLÆ Sermone Latino.III. Scrutinium Chymicum VITRIOLI, Auth. Joh. Georgio Trumphio.IV. Francisci Dele Boe Sylvii PRAXIS MEDICÆ Idea nova, Lib. I.
The Variations
of the Magnetick Needle predicted for many yeares following.
THe Doctrine of the Magnet and Magnetical Motions is yet so obscure, that what hitherto hath been discoursed and written upon that Subject, proves very unsatisfactory to Men,
T t t t
that
