W Ag? WR & P.O: WT: S. IIL 
ceularly to the plane of the card: After cutting the quill 
off {quare at both ends and fixing it, I laid the card upon 
the mouth of a wine glafs, filled with water to within one 
fifth or fixth part of an inch from the lower orifice of the 
quill; then applying my mouth to the upper part, I drew 
out the air in the quill by a ftrong fuCtion, and in one 
draught of my breath drew in about a {poonful of the wa- 
ter; this by ftronger fuctions I was able to repeat again 
and again, the quill remaining as before. The water, as 
I expected, did not aicend to the mouth ina ftream, as it 
would have done had the quill reached below the furface ; 
but broken and confufedly mixed with the air which afcend- 
ed with it; as is.above fuppofed to be the cafe in the afcent 
of water in a {pout at fea. 
In this experiment the fution occafioned a vacuum, or 
at leaft a great rarefa@ion of the air, within and direAly 
under the quill; the furrounding air of courfe flowed in 
from every quarter to fupply it, rufhing up into. the quill, 
and through it to the mouth; the preffure of the atmof- 
phere being thereby taken off from the furface of the wa- 
ter immediately under the orifice, while the preffure upon: 
the furrounding furface remained, and was probably in- 
creafed, the water was forced up together with the air as: 
above notwithftanding the quill had no manner of com- 
munication with the water. If the fu@ion be made very 
ftrong, and the quill be fixed at the diftance of a quarter 
of an inch or more from the water, a confiderable agitation 
and ebullition takes place in the water under it, fimilar to: 
that obferved in moft natural water f{pouts, and the paflage: 
of the water from the furface to the quill becomes very 
vilible. 
{t was hinted in a preceding note, that water fpouts at 
fea and whirlwinds at land, fome fpecies of them at leaft, 
arife from the fame caufe, how different foever their ap-. 
parent effets may be. This I think is made fufficiently 
evident from the obfervations of a couple of land fpouts at 
Hatfield 
