TO MISS MARY STEVENSON.
Method of contracting Chimneys. Modesty in
John Ewing to B. Franklin. 4 January, 1770.
Transmitting Observations of the Transits of Venus
and Mercury. - Proposal for an Observatory in
To Nevil MASKELYNE. 12 February, 1770.
Containing an Account of Professor Winthrop's Ob-
servation of the Transit of Mercury over the Sun,
November 9th, 1769
To MICHAEL HILLEGAS. 17 March, 1770.
Respecting covering Houses with Copper 329
JOHN EWING TO B. FRANKLIN. 14 June, 1770
To SAMUEL RHOADS. 26 June, 1770.
On securing Houses from Fire
To THOMAS PERCIVAL.
On the different Quantities of Rain which fell at
different Heights over the same Ground
W. SMALL TO B. FRANKLIN. 10 August, 1771.
Opinions of the Ancient Physicians respecting Ca-
tarrhs or Colds
To M. Le Roy. 20 April, 1772.
Intended French Voyage to the North Pole. - Mr.
West, President of the Royal Society. - Messrs.
Banks and Solander
To Joseph Priestley. 4 May, 1772.
Electrical Experiments.— Imperfection of the Abbé
Nollet's Electrical Machine. - One on an improv-
ed Construction sent to M. Le Roy
Joseph PRIESTLEY TO B. FRANKLIN. 3 June, 1772.
Experiments on Air
Joseph PriestLEY TO B. FRANKLIN. 1 July, 1772.
Curious Experiments on Air, and Discoveries of