Extract of a Letter from Mr. John Bartram, of Philadelphia, to Benjamin Franklin, LL. D. F.R. S. Relating to a Remarkable Aurora BorealisAuthor(s): John BartramSource: Philosophical Transactions (1683-1775), Vol. 52 (1761 - 1762), p. 474Published by: The Royal SocietyStable URL: http://www.jstor.org/stable/105651 .

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1NXXIII. FJcgrnS sf a Letter from Mr. John Bartram, of Philadelphia, to njamsa Franlilill, LE. D. F. R. S. relatxng ta vo

resnarkatle Hzgrora Borealis. Phila.delphia, Nov. IZ, I757.

readseb.2y, ' TERE is a vifible Aurora borealis; 176z. ML at feven o'clock, it was about two

hours high, to the northward pretty bright, Soon after daylight difappeared, it was much Inore ealt, vlaere it was redder, with fome faint fireamers, whofe points reached near forty-five degrees elevation, wllicl ioon difappeare(l, and the light clekended, by degrees, vltlde1 tlle l3ole, and by ten o'clocle was near extin&. I ilaotlld be very glad to know, whether (and how) -it appeared this r};ght with you, wich may afllIt in fome philofoplzical enquiries. I liave not obServeil any, this fall, before. Yeitierday, the weather was cool and cEcar, anvl the wind pretty firong at north; and I believe this the coldeR evening we have had this falli,J tllough tliis we-ck ve liad ice as thick a a- dcallar.

ExtrvA f zbe Snff;ezer go tZ§e above Leztert

London, Jan. 1 I 795 8.

I Thalzk youi for your accouIlt of tbe AuronaX A very confiderable one appeared here the fame eveningb

beingSaturday, Novembers2. IdidnotSeeit, lDut: haave hea1Xd of it from feveral. If it was ttie fame, thaE

you faw, it muIt have been very high, or very estun- iveZ as the two places are I 000 leagues afunder>.

LXXI. 0s

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