An Extract of a Letter from James Logan, Esq; To Sir Hans Sloane, Bart. R. S. Pr. concerningthe Crooked and Angular Appearance of the Streaks, or Darts of Light'ning in Thunder-StormsAuthor(s): James LoganSource: Philosophical Transactions (1683-1775), Vol. 39 (1735 - 1736), p. 240Published by: The Royal SocietyStable URL: http://www.jstor.org/stable/104013 .

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Is 24 ExtraA ef;v Letterf;rom James Logan, F>; to Sir Hans Sloane, -Batt. R. & Tr; cotscernixg be crooked vnd arzgul-ar Sppevraace of the Streakst o* iDalts q/ LlgXlt'ning i^s Thsnde^ Storaz3s.

Tliladelphi4 Sept t°9 t 7 3 se T Shall craste thy ludulgence further to add, that 1 Sooklug into the SccondVolulue ofthat inge nious Gentl-+erilall Stephet Haless S;taticks, of X<hich I tlave lately happolleda to hatte aycurIbry ViesvX I obiere7ed him to mentiotl that PhaIlotnenon of the Streaks or lDarts of Light'ning -in Thunder- Storms appearing crooked and angular (I do not re- member his Words) as a ching llot yet accounted for ;- and therefore he gueINwed at a Solu-tion of it*.

The Clouds are generally diRitEt Colledions of Vapours lilce Fleecess and therefore the Rays of Light thro them muR paSs thro' very diSerent Den f1ties arsd accordingly fuSer very great Refrad;tions: From thence therefore, undoubtedly, that Appear- ance muR arife For it is moR highly abfilrd to ima- gne, that Firedarted withfuch a Rapidity,canfrom any affignable Caule deviate in Fad: from a Right uLincX in the Manner it appears to us, And this, if duely confideredX may probably be found a plenary Solutionv

t See Stepi. Hales's Stat;l Elpays Vol. 2d. p, a9W: Obf rS

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