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ADDLFLONAT.NNOHES.

<< mmmeriiPrrmmuuuunn

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OTE 1.--METEORS.

TT f'hrze are four ſtrata of the atmoſphere, and four kinds of meteors. 1. Lightning is eleCtric, exiſts in viſible clouds, its Mort courſe, and red light. 2. Shooting ſtars exiſt in viſible vapour, without ſound, white light, have no luminous trains. 3. Twilight; fire-balls move thirty miles in a ſecond, and are about ſixty miles high, have luminous trains, occaſioned by an eleCtric ſpark paſing between the aerial and inlammable ſtrata of the atmo- ſphere, and mixing them and ſetting them on fire in its paſſage; attracted by volcanic eruptions z one thoufand miles through ſuch a medium refifts leſs than the tenth of an inch of glaſs. 4. Northern lights not attrated to a point but diffüſed; their colours; paſſage of ele&ric fire in vacuo dubtous; Dr. Franklin's theory of northern lights countenanced in part by the ſuppoſition of a ſupe- rior atmoſphere of inflammable air; antiquity of their ap- pcarance 3; deſcribed in Maccabees,