[ roo9 1 
*;astliat force continues, or theiorccof others fent after 
them on the like errand (which rather impells them far- 
ther, then gives them leave to fail,) till either fuch force 
abate, or the great weight of fo many things fiifpended, 
doth overpower, not only the ^irs weightj, but the 
lirength of that, that impelled them. 
And that there are fuch Fumes and other like matter 
projecSted upwards, from the Bowels of the Earth, and 
lome of them with great violence, is undeniable, not 
onely from Earthquakes, and other eruptions (with great 
noifes,) as well ot Vapours, as of Burning Mountains ; 
but even Poifonous Steams (and others,) in Mines, and 
Bubbling fprings (where Bubbles of^ir are feen to make 
theirpaflage through the W"ater,)and other perfpirations 
of^/Vor Vapour thr©ugh cranies or fmall paffages of 
the Earth, difcoverable by Steams ('whereof fome will 
take fire at the light of a Candle,) or by the moving of 
Leaves and other light things la id on the mouths of fuch 
private paffages, and by many other means. And to 
luch caufes I do principally attribute the Origine of 
Winds, and the afcent of moft other things, which, from 
this lower World, mount into the Jir, And, without 
this, the comparative gravity of the Jir and them,would 
give us but a lame account of them. 
There is yet another notion fuggefted, which is alfo 
very confiderableasto this affair : which is, the weaken- 
ing or ftrengthening the fpringof the ^/r. That Water 
hath (of it felf,) nothing of ipring or Elaflicity (other- 
wife then by reaion of fome Jiry parts, or other elaflick 
body?, which may be included within it,) is generally 
heldi at leaft none eonfiderable, inch as by any experi- 
ments hitherto made , can be clearly evinced fo to 
be. 
But, that the Jir (fuch Air at left as is the common 
^/r which we are converfant with,J is Elaftick^ is, I 
think, out of doubt: the expeiiments which prove 
D d 2 its 
