(5159) 
weight of the Atmofphere was not confidcrabk enough to 
operate feofibly upon the reft '( and of Tuch loftaoces I 
have had opportuoity to obferve one or two within thefe 
laft three daies : ) And therefore 'cis not aoiifsj to poife a 
greater number of Bubbles together, thatjafter tryal made 
of allj the fitteft may be chofen. Which Adveriifemeoi: 
will appear themore proper ^ becaufe of what is to be ad- 
ded in the following Note. 
2.1 have obferved it fometimes to happeo^that a Bubble^ 
that floated when 'twas firft poifed, would after a whik 
fubfide without any manifcft Caufe , or if it were made to 
fioLbyfuch a caufe, ic would continue at the bottom of 
the Water, though that caufe were removed : Which difiji- 
cult Phoenomenon fceming to depend upon a kiftd of Im^ 
bibition made of certain Particles of an Aereal Nature by 
the Waters the confidcration of it belongs to another 
place^not to this h where it may fufBce, thai the experiment 
did fometimes adually anfwer expectation as that above* 
related did 5 wherein my main drift was toftieWjthat fiuce^ 
as the Atmofphere is heavier or lighter,'tis capable to woi k 
upon Bodies under Water fo as to procure their finking, or 
their emcrfion 5 the Air ( though a fluid a thoufand timcy 
lighter) muft lean or prefs upon the Water it felf, by whof@ 
intervention it produces thefe effcils 5 which confirms what 
I clfe where teach ^ that the Atmofphere is incumbent as a 
heavy Body upon the Terraqueous Globe* 
3, Befides the other Circumftances, upon whofeaccouql 
this Experiment may fail of fuccefi, the feafon of the Year^ 
wherein lis tryedjmay, for ought I know, be confiderabk* 
For which reafon I fliall here add this Ad vertiicmenrj Thai 
I choofe.but do not confine my felf, to make my Trf als a-f 
bout the beginning of the Spring, as a time wherein oors« 
ble alterations of the Air, as well as to Weight, as to othei 
ihiogSj are the likeliefl: to be frequent. 
Sofar this Experiment 2 which nponihis eeca^on is UkelpM 
he imfrmUl unto a kjnd of Barolcope s which, togethtrmth 
an Hygrofcopej ma^ be expeSed ere lopgfrQmibefime hmd.4 
