I N D

E X.

Lightning, effects of it on a wireat N. York, 180, 18 ,.

- reasons for first proposing

the experiment on it, 322,

32 3 -

--how it shivers trees, 415

—>— strikes Mr. Weft' s pointedrod, 394, the rod delcrib’d,395. Effects of the light-ning upon it, 396.

-accounts of its effects on

conductors in Carolina, 416,tS seq.

--remarks on those accounts,

420, ct? seq.

-- does not usually enter

houses through open doors orwindows, 423. Should bedistinguished from its light,424. An explosion or clapof thunder always accompa-nies it, tho’ not always heard,ibid. Observations of itsstriking St. Bride’s, 440.

-a paper on it written (by

request) at Paris, 479. Dan-ger from it, how best avoid-ed, 484.

Linnæus, an instance of publicbenefit arising from his know-ledge of infects, 447.Luminous appearance of sea-water considered, 273, ct? seq.

-objects, make impressions

of some duration in the eye,

469. ,

Luxury, extinguishes families,

333 -

-not to be extirpated by

Laws, 339.

M

Magazine of Gunpowder, howto secure it from lightning,441, IS seq.

Magic Squares, account of some,350 .

Magic Circle, account of one,354 -

Magical Picture describ’d, 29,30 .

Magnetic Bars, experiment (hew-ing their mutual repulsion,406.

Magnetism, communicated toneedles, by the electric stroke,90, 91, 178.

Manners, their effect on thewelfare of states, 332, £s? seq.

Marly, the experiment of draw-ing lightning from the clouds,first succeeds there, 107.

Marriages, what increases thenumber of, 197.

-why delay’d in old coun-tries, ibid.

-why early and more gene-ral in America, 198, 199.

Maryland, account of a whirl-wind there, 356.

Meal, Grain, &c. manner ofpreserving them good forages, 443-

Medicated electricity, impracti-cable, 82, 83.

Melody ,