*('9 ) 
f 5 Which Cafe, 
m RefiftaD« of the Air, which increafes as the 
Square of the Velocity of the defcending Cloud 
caufes the float ns Parti rIpQ nf Wo ^ ' 
.h. po.» of 
No^ gentle Defcent^of a Cloud, but only an acce 
ler^ed Motion downwards, produces RaL 
N. B. 1 don t mean that the quick TteTcent of a. 
Cloud ts the only Caufe of Rain , becaufi the Shock 
from a Flajh of Lightning, and 'the fudden return 
'^7' ^ Vacuum made by the Flafh 
■mill condenfe the floating Vapour into IVater- and 
alfo the fame Cloud which in the free Air, mieht be 
carried horizontally wit hout being turned into ^Rain 
meeting ■with an high Hill 'in^ts Way will hi 
cmdenfed and fall in Drops -iffpecially if, in the 
‘Day-time, it be driven by the Wind out of the Sm 
fi’tne, ^gainft the Jhaded Side of the MoLal 
' all this, if Particles of Fire were ioined 
with thofe of Water to raife them- up. thoft igneous 
Particles mull be=at leaft lodo Times greater to Bulk 
^an the vratry ones ; fo that a Perfol, who at the 
Top of a Hill, has his Hands and Face in a Clnnrl 
muft feel a very fenfible Warmth, by toucSng t 
much greater Surface of - Fire than Water' in fhe 
Cloud, and aftertyards. find the Rain- pxodured from' 
that V^our fenfibly colder ; whefeas'the <?ontrarv 
ln^h°ectt tho3 
Bottom ’ Raw at 
^ t There 
