Numb. 421.
PHILOSOPHICAL
TRANSACTIONS.
For the Months of October, November and December, 1731.
The CONTENTS.
I.A Proposal of a Method for finding the Longitude at Sea within a Degree, or twenty Leagues. By Dr. Edmund Halley, Astr. Reg. Vice-President of the Royal Society. With an Account of the Progress he hath made therein, by a continued series of accurate Observations of the Moon, taken by himself at the Royal Observatory at Greenwich.
II.An account of the Contrayerva, by Mr. William Houstoun, Surgeon in the Service of the Honourable South-Sea Company.
III.A Letter from Jacob de Castro Sarmiento, M.D. and F.R.S. to Cromwell Mortimer, M.D. Secr. R.S. concerning Diamonds lately found in Brazil.
IV.Viri celeberrimi Johannis Marchionis Poleni, R.S.S. ad virum Doctissimum Jacobum Jurinum, M.D. R.S.S. Epistola, qua continetur Summarium Observationum Meteorologicarum per sexennium Patavii habitarum.
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