C 150 ] 
My fear of trefpafling upon your patience had al- 
moft made me forget to explain, how far the wind 
affifts vapours to rife in greater quantities, and in lefs 
time, than they would in a quiet air. And this 
omiflion would not be excufable, becaufe both the 
learned and unlearned have obferved, that a greater 
quantity of vapour is carried off in dry windy wea- 
ther, than when the weather is calm. When va- 
pours are emitted in great plenty from the furface of 
fluids, fuch as from a pot before it begins to boil, 
or from the furface of a bowl of hot punch, &c. it 
often happens that they croud each other in fuch 
manner, that the furrounding electrical fluid of each 
jparticle is comprelfed, and cannot occupy that por- 
tion of fpace, which is necelTary to make it buoy up 
the particle : and thus the particles float in a fleam 
juft above the furface of the liquor, and they are 
prevented from falling back into the liquor by the 
electrical fluid on the furface of the liquor ; in which 
ftate none but the upperrnoft particles can afeend ; 
which they do by the elafticity of the eleCtrical fluid’s 
forcing them upwards, till they have room for the 
electrical fluid thoroughly to expand itfelf, fo as to 
be able to buoy up the inclofed particle of vapour. 
In this ftate the afliftance of the wind will be eaflly 
underftood ; for the wind blowing the vapours from 
the furface of the liquor, diflipatcs them, and* gives 
them room to .afeend, and clears the furface of the 
liquor, to make room for the fucceeding vapours to 
afeend, and fo on ; which in this cafe will greatly 
aid the afeent of vapour. And thus far I think 
that the wind afllfts in the afeent of vapour, but no 
farther. 
I have 
