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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

347

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

355

To John Pringle. 21 December, 1757.

On the Effects of Electricity in Paralytic Cases 359

To Thomas HUBBARD. 28 April, 1758.

Electrical Apparatus. — Description of a Battery · 361

To William HEBERDEN. 7 June, 1759.

On the Electricity of the Tourmalin

363

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 ,

367

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

. 378

Accounts from Carolina (mentioned in the foregoing

Letter) of the Effects of Lightning on two of the

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