[ioo3] 
tei-ballance oi the ^/Vs weight, as the true caufe» And 
that therelore ^ir, which was before thought to be a 
light body, was but comparatively lo, and had iadeed 
a pofitive gravity, though lefs then that of other bodys 
which we are converfant with. 
This notion, was happily purfued by (a. Succeffor of 
Galileo J Torricellioi who did rationally argue ; that, if the 
u^irs counterpois was fiifScient to raiie and (uftam water 
at that height, and but to that height; then moft it be 
a jutt counterpois to a lighter Liquor at a greater height; . 
but, to a heavier Liquor, at a lefler height. And mak- 
ing aneflay thcreoi in ^itcl^^^Silver, found it tolucceed 
accordingly.- and, in a jult proportion to the refped:ive 
gravities oi thofe fluids. 
And he hath, by this means, made the experiment 
^commonly called the Torricellian experiment,) much 
more manageable ^icj^Silver (in VeiTels of about 
29 Inches, meafurej then before it was, with wa- 
ter, in much taller Veflels. 
Inpurfuance of this notion, we find, by feveral forts 
ofBarofcopes (or weight-wi(ers,j not only that the Jir 
haih gravity, but that it hath a different gravity, atdit- 
ferent times and places; according as its counterpois is 
ablQ to iu(\.2im ^2 c ^-Silver at difterent heights: fome- 
times a little lower then 28 Inches, fometimesa little 
higher then io Inches, and at other times ar fome mid- 
dle hight between thefe, here with us. Which different 
weight of the y^/r, or ^tmojphere, may reaionably be fup- 
poied, partly to proceed from, and partly fas Dr. Gar- 
well intimates, y to ^ive occafion 01 differeace m the 
weather and winds. 
The particulars of his difcourfe (having not the Paper 
with mc, and hating but heard it once read,) 1 may pof- 
fibly mil-remember. But, as to the main iiv\ix of it, fbe- 
ing a notion not wholy new- to me,) I think I do not mil- 
take. . .-i^igi^itic^ 
C c i That 
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