Boyle, Robert - New experiments physico-mechanicall, touching the spring of the air and its effects

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The 34th Experiment, containing ſeveral
attempts for the weighing of light Bodies in
the exhauſted Receiver. 258 &c.

The 35th Experiment, touching the cauſe
of Filtration, and the riſing of Water in
Siphons, 262 &c. A relation of a new
kinde of Siphon, of the Authors, upon
the occaſion of trying the Experiment
lately obſerv'd by ſome French-men, and fur
ther improv'd by himſelf; and ſome conje
ctures touching the cauſe of the exhibited
Phænomena. 267 &c.

The 36th Experiment, touching the weigh
ing of a parcel of Air in the exhauſted Veſ
ſel; and ſome other Obſervations for the ex
plication thereof, 272 &c. An accidental
Experiment, tending to the further confir
mation of the Authors Reflections upon the
firſt Experiment; with a digreſsive Obſer
vation, noting the ſubtil penetrancy of ſome
Spirits, to exceed by far that of the Air, 275
&c. And ſome other Experiments to ſhew the
difficulty of the ingreſs of the Air into the
pores or holes of ſome bodies into which Wa
ter will readily inſinuate it ſelf, 279 &c. with
a conjecture at the cauſe thereof, 282. The
Author returns to the proſecution if the in
quiry after the gravity of the Air: But firſt,
(upon the occaſion of the tenacity of a thin

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