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Feb. 16. 1670/1. The Expt. of the 2 balls was made again with by the contriuance of a Bow. and they seemed to most of the
company to come to the ground at one & the same time, yet for more certaintys Sake, it was orderd to try it again the next Day.
The Curator produced a module of the Little box to be thrust into the body of a tree bored to finde out the ascent and descent
of the Sap. the care of making this Expt. was comitted to Mr Charles Howard who promised to undertake it. -
The same produced a picture done by himself vpon taffety after a unusuall way. vizt by printing it and then giuing
it the colours. which doe appear aequally well on both sides. being Varnisht ouer & transparent, he said he had
the Varnish from Mr. Wilde. ---. The Curator being calld upon to make a report of the successe of the Expts -
he was the Last day Orderd to try in the air vessell, desired to haue time giuen him till the next meeting, and that
he would not faile to make against that time some tryall in priuate, of the sucesse whereof he would then
inform the company.-
Feb: 23. The Curator reported concerning the air Vessell, that he had been in it for about a quarter of an howre
and found not any inconuenience vpon the Exhaustion of the Little air that was drawn out. He added that
he conceiued a man could not indure much more then the euacution of a fowrth part of the air conteind in the Vessell
He was orderd to prosecute this Experiment, and to take some animalls & lighted candles &c with him into the Vessell.
It was also agreed upon that on Munday next in the afternoon as many of the Society as pleasd should meet in Gresham
Colledge at the Curators Lodgings and be present at the Expt. --- Mr. Hooke mentiond that he did intend to employ
a pair of Bellows in the Vessell, thereby to Blow out the air, more readily & more effectually. -- Listers letter abt
a black sap for ink.
March. 2. The Curator made a Report concerning the Sucesse of the Expt. made in the Vessell for Rarifying
the air. vizt. that himself had been in it, and by the contrivance of Bellows & values blown out of it one -
tenth part of the air (which he found by a gage suspended with the vessell) and had felt noe other Inconve
nience, but that of some pain in his Eares at the breaking out of the air haboured within them and the like
pain vpon the readmission of the air pressing the Ear inwards. -- It was orderd that this vessell should be
in a redinesse to make the expt for these of the Society that should be at Leasure to come to Gresham Colledge
and be present at it on munday next in the afternoon. [.Bisp. of Chester abt cutting the Kidney of a Dog ] -
The Curator appointed to prepare expts. for Entertainmt of 2 noble Florentines next Day -
March. 9. There was made an Expt. contriued by the Curator, wherby some flower put into a void shallow glasse
with a large sloping brim and a pretty tall foot was made to Rise and Run ouer like a fluid, by the knocking
of the glasse, and by the forcable moving of ones finger round about the upper edge of the same. Leaden bullets
also being put in this glasse did likewise by knocking moue in it like a fluid --- this was proposed to Consider
what might be the cause of this motion especially of the phenomenon that the Powder ascending did Run
ouer, and not fall any ways back into the vessell. - The Curator mentiond that he thought that it might con-
tribute to Explicate the cause of Grauity, and suggest to us an hypothesis to explicate the motion of grauity by.
It was orderd that vessells of Different metall should be prepared to make this expt. with especially of Brasse to strike more boldly.
[Chr. Cocks burning concaue of 16 inches producd. he was ready to vndertake to make one of 6 foot Diameter for. 100 ll. Sterling.
It was thought fitt that he should be encouraged to perform his vndertaking a Burning concaue of that bignesse being
like to increase heat to such a degree, as nothing els in Nature would be able to effect the like -- the air vessell being -
againe spoken of, it was orderd that since the Curator had failed in making the Expt. at the time formerly appointed. it
should be made on munday next in the afternoon seuerall of the Society promising to be present.
The Curator mentiond that he had Lately obserued March 4. the congresse of the moon with the media trium in cauda
arietis, a fixed star of the 3d magnitude and had found the time of its subengresse pretty neer to the time calculated by Mr.
Flamstead. who sets down the time to be 10o. 14'. 52". which was found to be 10o. 12' circiter. The Curator said
he had obserued that wheras a star as soon as it toucheth useth to Disappear. this Star touching the south part
of the moon did slide all along the edges of the moon, which he thought could proceed from nothing els but the
refractive air about the moon -- It was suggested that persons residing in farr different Latitudes might
be engaged to correspond with us in making such obseruations as these - d-cap. hubbard &c [Lister letter about
Kermes &c . March. 16. noe sitting. -
Mar. 23. The curator brought the Report of the Expt. he had again made in the air vessell, which was that he
had blown f out f one fowrth part of the air that was in the vessell estimated by a gage, and that he had continued
in it somewhat more then a quarter of an howre without any other inconuinience saue only that he felt some
pain in his eares and found himself deaf whilst the straining of the air was vpon him in blowing out the air
which pain and Deafnesse he likewise found vpon the forceable rushing in again of the air into his Eares
But that when he was come out and had walked a little while vp & down his hearing came again to him
He added that hauing taken a Candle burning with him into the vessell, the candle went out Long before he
felt any of that inconuience in his Eares. -- The Presdt who had been at this Expt. added that though the
Curator had continued somewhat aboue a quarter of an howre in this Engine, yet a quarter of the air in
the vessell had not been kept out all that while, but that now and then fresh air had been lett in.
meantime the Experimenter had indured for a Little while the absence of 1/4 of the air without other
inconuenience then the abouementiond. --- The same produced again the experiment of making
flower moue in a Bell glasse like a fluid seuerall ways vpon the knocking of the vessell in seuerall
places, which he thought considerable things in Philosophy depended vpon, but declared noe particular
He also shewed a way of making a very great Burning concaue by means of severall peices of glasse
Lined with a mixture of Mercury & Lead, and put together vpon the concaue side of some hemispheri
=call body of wood. He was Desired to make a tryall of it. [mention being again made of mr Coxes rediness
to make a great burning Concaue It was suggested that the King might be moued to comand it to be made -
winthrop & malpighius Letters. Leibnitz Hypothesis Physica &c - mr. Boyle D Wallis D Wren & mr Hooke to peruse it
and Report their sense of it. Burning concaue & Glasse bell to be prosecuted next Day. -
Mar: 30. 1671. The Curator Represented by quicksiluer in a triangular vessell sharp at one end, the reason of the
tides rising soe high vpon the Coast as Bristoll and in some other places, which yet was conceiued by some of the Com
pany, would not hold to make out the exceeding high tides vpon the Coasts of Brittany in France.
The same produced again his glasse bell with flower in it, to shew to the eye, that according to the seuerall-
Strokes or pulses made vpon the Glasse, the air thence Receiued as many ^ /seuerall/ impressions, it being manifest by this
Experiment, that as euery Different stroke made a Different Sound, soe by making a different impression
on the flower, gaue it as many seuerall motions. It appeared also that the powder goeth from the place
whence the pulse cometh, and that in a perpendicular puls, the powder hath a kind of vibration.
as also, that as long as the sound of the bell lasteth the powder seems to be fluid, but as soon as that
Ceaseth the powder also lyeth still. It being conceiued that this Experiment may much contribute
to the Explication of the Nature of the internall motion in Bodys, the curator was orderd to prosecute it
The same Reported concerning the Expt. made with the air vessell, that when he was in it he found not his heart beat quicker
his pulse continuing the same.

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