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arising from Experiments and Observations made

at Philadelphia, 1749.- Golden Fish. - Extrac-

tion of Emuvial Virtues by Electricity impracticable 227

Additional Experiments; proving that the Leyden Bot-

tle has no more Electrical Fire in it when charged,

than before ; nor less when discharged ; that, in

discharging, the Fire does not issue from the Wire

and the Coating at the same Time, as some have

thought, but that the Coating always receives what

is discharged by the Wire, or an equal Quantity;

the outer surface being always in a Negative State

of Electricity, when the inner Surface is in a Posi-

tive State

253

To James BowDOIN, AT Boston. 25 October, 1750.

Enclosing Papers on Electricity

255

TO A FRIEND IN BOSTON. 25 December, 1750.

Account of an Accident while making an Electrical

Experiment

255

To James Bowdoin. 5 September, 1751.

Introducing Mr. Kinnersley as a Lecturer on Elec-

tricity

257

To CADWALLADER COLDEN. 1751.

Unlimited Nature of the Electric Force

258

Queries and Answers referred to in the foregoing Letter.

· The Terms “ Electric per se.” and “ Non-elec-

tric” improper. - New Relation between Metals

and Water. - Effects of Air in Electrical Experi-

ments. - Experiment for discovering more of the

Qualities of the Electric Fluid .

259

JAMES BOWDOIN TO B. FRANKLIN. 21 Dec. 1751.

On the Causes of the crooked Direction of Light-

ning. — Objections to the Hypothesis that the Sea

is the Source of Lightning. – On the Swiftness of

the Electrical Fire

263

To James Bowdoin. 24 January, 1752.

Observations on the Subjects of the preceding Let-

ter. — Reasons for supposing the Sea to be the

grand Source of Lightning. — Reasons for doubting

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this Hypothesis. - Improvement in a Globe for

raising the Electric Fire

269

E. KINNERSLEY To B. FRANKLIN. 3 February, 1752.

New Experiments. - Paradoxes inferred from them.

— Difference in the Electricity of a Globe of Glass

charged, and a Globe of Sulphur. — Difficulty of

ascertaining which is positive and which negative 273

To E. KINNERSLEY. 2 March, 1752.

Probable Cause of the different Attractions and

Repulsions of the two Electrified Globes mentioned

in the preceding Letter

275

JAMES BOWDOIN TO B. FRANKLIN. 2 March, 1752.

Effect of Lightning on Captain Waddel's Compass,

and on the Dutch Church at New York .

276

JAMES BowDOIN TO B. FRANKLIN. 16 March, 1752.

Remarks on Dr. Colden's Letter respecting the

Electricity of the Clouds

279

To E. KINNERSLEY. 16 March, 1752.

Reasons for supposing that the Glass Globe charges

positively, and the Sulphur negatively. - Hint re-

specting a Leather Globe for Experiments when

travelling

280

To CADWALLADER COLDEN. 23 April, 1752.

Mistake, that only Metals and Water were Con-

ductors, rectified. - Supposition of a Region of

Electric Fire above our Atinosphere. — Theorem

concerning Light. - Poke-weed a Cure for Cancers 283

M. DALIBARD's Account of an Electrical Experiment at

Marly

288

ABBÉ MazéAS TO STEPHEN HALES. 20 May, 1752.

Giving a further Account of the Electrical Experi-

ment at Marly

293

To PETER COLLINSON. 19 October, 1752. .

Electrical Kite

295

W. Watson To The Royal Society. 21 Dec. 1752.

Concerning the Electrical Experiments in England

upon Thunder-clouds.

296

To James Bowdown. 12 April, 1753.

On the Mode of coating Electrical Jars

299

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340

Experiments made in Pursuance of those made by Mr.

Canton, dated December 6th, 1753; with Explan-

ations, by Benjamin Franklin. 14 March, 1755 . 341

Turkey killed by Electricity.- Effect of a Shock on

the Operator in making the Experiment

346

To John LINING. 18 March, 1755.

Differences in the Qualities of Glass. — Account

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of Domien, an Electrician and Traveller. - Con

jectures respecting the Pores of Glass. - Origin of

the Author's Idea of drawing down Lightning. -

No satisfactory Hypothesis respecting the Manner

in which Clouds become electrified. - Six Men

knocked down at once by an Electrical Shock.

Reflections on the Spirit of Invention

To M. DALIBARD. 29 June, 1755.

Beccaria's Work on Electricity. - Sentiments of

Franklin on pointed Rods, not fully understood in

Europe. - Effect of Lightning on the Church of

Newbury, in New England. - Remarks on the

Subject

To John PRINGLE. 21 December, 1757.

On the Effects of Electricity in Paralytic Cases

To Thomas HUBBARD. 28 April, 1758.

Electrical Apparatus. — Description of a Battery

To WILLIAM HEBERDEN. 7 June, 1759.

On the Electricity of the Tourmalin

E. KINNERSLEY TO B. FRANKLIN. 12 March, 1761.

Experiments on boiling water, and Glass heated by

boiling Water. — Doctrine of Repulsion in elec-

trized Bodies doubted. -Electricity of the Atmo-

sphere at different Heights. — Electrical Horse-

race. - Electrical Thermometer. — In what Cases

the Electrical Fire produces Heat. — Wire length-

ened by Electricity. - Good Effect of a Rod on

the House of Mr. West, of Philadelphia

To E. KINNERSLEY. 20 February, 1762.

Answer to some of the foregoing Subjects. — How

long the Leyden Bottle may be kept charged. -

Heated Glass rendered permeable by the Electric

Fluid. — Electrical Attraction and Repulsion. -

Reply to other Subjects in the preceding Paper.

Numerous Ways of kindling Fire. – Explosion of

Water. -Knobs and Points

Accounts from Carolina (mentioned in the foregoing

Letter) of the Effects of Lightning on two of the

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