Dr. Eajon on the AJcent of Vapour '. 395 
not be compelled to criminate and condemn 
themjelves. Or, according to the juft fimile of 
the poet. 
“ Whilft reafon holds the helm— 
“ Let pajjion be the gale.” Pope. 
And let imagination fly abroad to colleft the 
various fcattered breezes, which, thus united 
into one ftrong current, may carry the vefTel 
forward, acrofs the ocean of life, under Juch a 
pilotage, with fafety, and fatisfadtion. 
An Essay on the Ascent of Vapour; By 
A. Eason, M. D. &c. Read Nov. 27, 1782. 
Unde ferenas 
Ventus agat nubes, quod cogitet humidus 
Aufter, Sol tibi figna dabit. 
Fir. Geo. C. I. ver. 461. 
'HERE are few phenomena in nature, which 
- 1 - have puzzled philofophers more, than the 
afcent of vapour: and the different theories laid 
down by Dodtors Halley and De/aguliers> have 
been rejedtcd, while another, not lefs liable 
to objections, has been almoft univerfally re¬ 
ceived. 
This theory, which I fhall prefently mention, 
was at firft invented by a French Gentleman, 
Monfleur 
