[ 240 ] 
Vida leguminibus folitariis deorfum flexis hir- 
futis. Sauv. Monipelienf. 237, 
17 fo Ulmus folio iatiflimo lcabro. Ger. Eraac. 1481. 
Lahore folio. Park. 1404, 
XXX. Remarks on the Opinion of Henry 
Eeles, Ffq\ concerning the Afcent of Va- 
pour , publifhed in the Philofoph, Tranfadfc. 
Vol. xlix. Part i, p. 124, By Erafmus 
Darwin, M. D. Communicated by Mr . 
William Watfon, F. R, S. 
To Mr. William Watlon, F, R. S . 
S I R, 
T H E inclofed papers were defigned for the 
perufal of the Royal Soeietyj being an en- 
deavour to confute the opinion of Mr. Eeles about 
the afcent of vapours, publifhed in the laft volume 
of their TranfaCtions. But the author, having no 
electrical friend, whofe fagacity he could confide in, 
has at length prevailed upon himfelf to be fo free to 
fend them to Mr. Watfon j to whom the world is 
fo much indebted for the advancement of their 
knowlege in electricity. 
Whence, Sir, if you fhould think, that thefe papers 
have truth, the great Diana of real philofophers, to 
patronize them, you will confer a favour upon me, 
by laying them before that learned Body. If, on the 
contrary, you fhould deem this confutation trifling 
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