[ I OG23 
A Dijcourfe concerning the Ai/sGr^vky^ od/ervdin 
the Barofcope, occafioned by that of Dr. Garden ; 
frefented to the Phil. Soc. (/Oxford, by the reve- 
rend Dr. Wallis, Frefidentqf/i?^/ Society. April, 
TH EDilcourfe of Dr Garden (vtad.zt our la ft meet- 
ing, J concerning the different ftate of the Jzr, 
in refped of its different gravity, hath in it a great deal 
of very irigenions fpeculation. And what I then faid to, 
ic^uppn the firft reading of it^and what 1 am now faying a- 
gain to the fame purpofe, is not to contradid: it, or de- 
trad:from it, but to add to it ; as a notion which I have 
long fince conildered, and judge it capable of further 
improvement. 
The notion of the ^/rV weight and fpring, hath been 
fo well fettled, by innumerable Experiments of this 
preient ^^^5- ; that hardly any confidering Perfon doth 
now doubt of it. 
And it hath chafed away from before it, the notion 
joiFu^^-^nrnty 4orm received r by fliewing us an ef- 
ficient caufe, of those effed:s, for whichbefore we could 
onely pretend to a Final caufe. 
The firft occafion ('that we know of,) of introducing it, 
was, from Galileo's difcovery, that water, by Pumping, 
was not to be raifed higher then about three or four and 
thirty foot (or not much mQre,j of our Englijh meafure. 
Which wa5 a certain argument, that the caufe of 
tliqfe efle4,s (commojaly alcribed to Fuga Facui,) was but 
of a Fulite Itrength : whereas, if natures fliunning a Va- 
cuity had been the true caufe, it was to have operated 
without ftint. ^ 
Where upon this Lyncean Fhilofopher (as he was called,) 
did, out of his great fagaciry, guefs happily at the coun- 
ter- 
