[ 430 ] 
From hence it appears, that the air at London 
was, upon feveral days, hotter than it had been ob- 
ferved at Madeira for ten years together : for, by 
Dr. Thomas Heberden’s obfervations, mentioned in 
the Philofophical Tranfadions, the heat of the air at 
Madeira, during that period, was never but once 
at 80. 
William Watfon. 
LV. Remarks upon the Letter of Mr. John 
Ellis, F. R. S. to Philip Carteret Webb, 
Ffq\ F.R.S. printed in the Philofophical 
Tranfadions, Vol. xlix. Part ii. p. 806 . 
By Mr. Philip Miller, F. R . £ 
Read Dec. i$. r g 'HE paper of mine, which was 
^ read before the Royal Society on 
the 8th of May 1755, and afterward printed in the 
xlixth volume of the Philofophical Tranfadions *, 
was written at the requeft of Mr. Watfon ; who in- 
formed me, that a letter from the Abbe Mazeas to the 
reverend Dr. Hales had been communicated to the 
Royal Society, in which it was mentioned, that the 
Abbe Sauvages had made a difcovery of the juice of 
the Carolina Toxicodendron flaming linen of a per- 
manent black. But Mr. Watfon faid, that the letter, 
he thought, required a careful perufal before it was 
printed - } and he wifhed I would confirm it. I told 
* Part I, p. 1 6 1. 
him. 
