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TO PETER FRANKLIN. 7 May, 1760.
On the Saltness of Sea Water
218
To ALEXANDER SMALL. 12 May, 1760.
On the Northeast Storms in North America
219
TO MISS MARY STEVENSON. 11 June, 1760.
On the Effect of Air on the Barometer, and the
Benefits derived from the Study of Insects
222
TO MISS MARY STEVENSON. 13 September, 1760.
On the Bristol Waters, and the Tide in Rivers
TO MISS MARY STEVENSON. 30 March, 1761.
Tides in Rivers
225
231
TO MISS MARY STEVENSON. 10 August, 1761.
Salt Water rendered fresh by Distillation.—Meth-
od of relieving Thirst by Sea Water
TO MISS MARY STEVENSON. 20 September, 1761.
-
Tendency of Rivers to the Sea. Effect of the
Sun's Rays on Cloths of different Colors
232
234
239
On the Method of securing Houses from the Ef-
fects of Lightning
241
DAVID HUME TO B. FRANKLIN. 10 May, 1762.
Remarks on the Mode of constructing Lightning-
Rods. Compliment to Dr. Franklin as a Philo-
sopher and a Man of Letters
243
TO JOHN BAPTIST BECCARIA. 13 July, 1762.
Describing a new Musical Instrument composed of
Relating a curious Instance of the Effect of Oil
on Water
253
tion. 26 February, 1763.
Congelation of Quicksilver.-Cold produced by Evapora-
JOHN CANTON TO B. FRANKLIN. 29 June, 1764.
The Melting of Metals by Lightning not a cold Fu-
256
260
263
269
EZRA STILES TO B. FRANKLIN. 20 February, 1765.
Thermometrical Experiments
TO LORD KAMES. 2 June, 1765.
On the Harmony and Melody of the old Scotch
Tunes
TO PETER FRANKLIN.
On the Defects of Modern Music
JOSEPH PRIESTLEY TO B. FRANKLIN. 21 September, 1766.
Relating to a History of Electricity. Curious
Experiments with an Electrified Chain.
To GEORGE CROGHAN. 5 August, 1767.
Conjecture as to Elephants being Natives of Amer-
On the Colica Pictonum, and Pernicious Use of
Lead in Distilleries
TO LORD KAMES. 28 February, 1768.
273
275
277
278
On the Difference of Navigation in Shoal and Deep
Water
283
A Scheme of a New Alphabet and Reformed Mode of
290
294
295
304
305
307
JOHN EWING TO B. FRANKLIN. 4 January, 1770.
Transmitting Observations of the Transits of Venus
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.
326
328
Respecting covering Houses with Copper
JOHN EWING TO B. FRANKLIN. 14 June, 1770
TO SAMUEL RHOADS. 26 June, 1770.
On securing Houses from Fire
332
To THOMAS PERCIVAL.
On the different Quantities of Rain which fell at
different Heights over the same Ground
336
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.
341
342
344
346
JOHN WALSH TO B. FRANKLIN. 12 July, 1772.
Experiments for ascertaining the Electrical Proper-
ties of the Torpedo
348
J. B. TODERINI TO B. FRANKLIN. 15 August, 1772.
Giving an Account of a Work published by him,
entitled "Filosofia Frankliniana"
351
Answer to M. Dubourg's Queries respecting the Armonica.
8 December, 1772
352
Some Directions for drawing out the Tones from the Glass-
es of the Armonica
353
On the Stilling of Waves by Means of Oil
355
TO HUMPHRY MARSHALL. 14 February, 1773.
On the Spots in the Sun; Dr. Wilson's New Hy-
pothesis
368
M. DE SAUSSURE TO B. FRANKLIN. 23 February, 1773.
Conductors of Lightning. - Project of the Royal
Society to ascertain the Attraction of Mountains.
Volcanic Eruptions.-Experiments on the Torpedo 371
JOHN WINTHROP TO B. FRANKLIN. 4 March, 1773.
Dr. Priestley. Effects of Lightning
375
To M. DUBOURG. 10 March, 1773.
On the Causes of Colds
378
To M. LE ROY. 30 March, 1773.
Mr. Wilson's Opposition to Pointed Conductors.—
M. Le Roy chosen a Member of the American
Philosophical Society.
379
To M. DUBOURG.
Observations on the prevailing Doctrines of Life
and Death
381
TO WILLIAM DEANE. 11 April, 1773.
A new-invented Carriage Wheel.-Explosion of
Melted Iron and Glass Drops in Water.-Stove
for consuming the Smoke.
383
To M. DUBOURG. 29 June, 1773.
Inquiries on the Causes of Taking Cold
Preparatory Notes and Hints for writing a Paper concern-
ing what is called Catching Cold
. 387
387
397
399
Unwholesomeness of Manufacturing Establishments.
-Moist Air not unhealthy
JOSEPH PRIESTLEY TO B. FRANKLIN. 26 Sept. 1773.
New Experiments on Air
TO JOHN INGENHOUSZ. 30 September, 1773.
Torpedo. Magnetic Needle. Nairne's Electri-
JOSEPH PRIESTLEY TO B. FRANKLIN. 14 Oct. 1773.
Experiments on Alkaline Air
ERASMUS DARWIN TO B. FRANKLIN.
402
404
24 Jan. 1774.
TO THE MARQUIS DE CONDORCET. 20 March, 1774.
Answers to Questions on Philosophical Subjects
TO JOHN BAPTIST BECCARIA. 20 March, 1774.
English Translation of Beccaria's Book. - Ex-
periment to show that Electricity does not pass
through a perfect Vacuum
411
413
To JOSEPH PRIESTLEY.
Effect of Vegetation on Noxious Air
414
TO JOSEPH PRIESTLEY. 10 April, 1774.
On the Inflammability of the Surface of certain
Rivers in America
JOSEPH PRIESTLEY TO B. FRANKLIN. 27 Sept. 1779.
Vegetation of Plants in Water
PIETRO TURINI TO B. FRANKLIN. 18 Sept. 1780.
Communicating Intelligence of a new Work on