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Feb. 12. 1673. Ash wensday noe meeting -
Feb. 19. E. India Copany musk deer Skin. Swamerda book & Redj 2 books. Boyles black willow. The curator tryd again the
expt. formerly attempted, to find whether air increases decreases by burning. But it miscarryd again, he was desird to fitt
it Better for the next meeting. [Redstruk grafts & Bolonia stone. Hecker moritio de in . Feb. 26. noe meeting.
March 5. Mr Hooke made an attempt againe of the tryall to find whether air is generated or Consumed by fire burning
But the apparatus faild again which he was orderd to fitt with Care. -- The same produced his arithmeticall
Engine he mentiond formerly, and shewd the manner of its operation which was applauded. He was desired
to bring in the Description thereof, that soe it might the Better appear how it did differ from that of
Mor Leibnitz. Lately also produced before this Society. [account of Redjs book by oldenburg.] Mr Hooke promi
sed to giue the Company a Lecture the next Day vpon his Weather clock.
[In margin]16.   March. 12. Mr Hooke read a Discourse of his vpon the Weather clock which being but a part of the whole
by him intended, he promised to bring in the Remainder conteining the Descriptio of the engine it self
at next meeting. He was Desired to take care that such an engine be made with speed. [toung & Reed
about trees] Schroter Skull couerd wth Mosse. [Gornia vpon Bp. Chesters Disease. Oldenb.7 Vol of Transactions.
[In margin]17.   March 19. Mr Hooke read a Discourse of his giuing an account of the sucesse of the Experiments he said
he had made about the increase & Diminution of air by Burning, which was that the air was Diminisht
one twentieth Part. He was desired to prosecute these Expts and to giue the Society an account from
time to time and to bespeak some of the Society to assist at his tryalls. -- The same was put in mind
to prosecute the matter of the weather clock, and to hasten the Structure of the engine it self. and not to
forgett the finishing of the Reflecting Speculum. [Swamerdam Lungs of froggs.
[In margin]18.   March 26. The curator made an Expt of mingling oyle of vitriol and water together, thereby shewing that these two liquors
were soe incorporated by entring into the pores of one another, that they took vp lesse rome when mingled together than
they did both being apart. of the comon water there were 21 measures of the oyle of vitrioll 3 measures, which is 24
measures in all and yet mixed together they made but 23 measures. [Cassinj's obseruatio of 2 new satelits about
. one within the other without tht of Hugenius. ones revolution in 4 1/2 Days, the other in about 80 Dayes. [Gregorys letter
about the strength of oblique reflection aboue direct & of the apertures of telescopes & Burning glasses [Redj & Maretettis
books
[In margin]20   Aprill 2 [Dealectica ad mentem Scotj. The Curator made an expt. with mixing oil of tartar & aqua fortis
together, to see how they would incorporate together and how much lesse space they would take vp when they incorpo
-rated, then both apart, the mixture caused a great Ebullition which Lasted all the while that the Society sat but it
Ran ouer severall times, and therefore the curator was desired to make it again [Flamsted Letr on keckers in
[Vz. Relation of a well making a noyse against foule weather.
[In margin]21   Apr. 9. Dr Bernard & Mr Leibnitz electd. Mr Hooke made an Expt. wth aquafortis & a little peice of Brasse wire
put into that Liquor marking where the liquor stood before the putting in of the Brasse & where after it was
put in, and also how far the same was Raysed vpon its working vpon the brasse and how low it descended
afterwards which was almost an inch below the mark at which it stood, at the first putting in of the brasse
Of which Expt & that of the Last day he promised to bring in a full account in writing.
[hugens Letter of Ian 14. concerning newton Theory & newtons answer. [Boyles book of flame & air &
against Dr Moor [Sr Ioseph Williamson going for Aix le chapel. [Beale of Perry.-
[In margin]23   Ap. 16. The Curator being calld vpon for an Expt and hauing none Ready he was orderd to prosecute the expts
Lately begun about the incorporation of Liquors, and to bring in a written account of those that had
been hitherto made [goddards drops half washed though hermet seald. the Curator sayd that spirituous liquors -
though well closed vp, would in time comonly loose their virtue and also their Bulk, the particles of it
passing into one anothers pores. [Swamerdam about anatomicall obseruatios.
[In margin]25   Apr. 23 There was made an Expt. with aq: fortis & pulverizd oyster shells in a bolt head tyed close about the open
end with a flaxid Bladder to see what it would produce, and it was found after a little while that theBladder
was swelled. It was ordered that it should be put as it was into the trunk of the Society, and to be left then lockd
vp, till the next meeting, to see whether these exhalations would proue permanant air. Mr Boyle mentiond
that he had frequently made such kind of Expts. and thereby produced true air which Lasted for seuerall
monthes together. [Lord Herbert East indian aromatick Bark. [Wormius his Booke de mure norweigico.
[In margin]27.   Ap. 30. noe meeting may 7. Ld Herbert proposd.] There was produced the bladder which a fortnight since
was somewhat inflated with air produced by Aq: fortis & powderd oyster shells & now much more swelled
then at that time. It was suggested that it should be tryed whether this air thus produced will serue for Bur
ning. that is whether a candle may be kept Burning in it as in Comon air. and if soe whether as long as
or a longer or shorter time. and that for this purpose this very air should be conveyed into another vessell
to burne bodys in it -- It was also ordered that this expt. should be tryed with a mixture of other bodys
to see whether air would be produced fit for Respiration. - It was suggested that it might
be considered whether the Aq: fort: be considerably wasted, or what quantity of it is Raised vp into air
for which end it would be necessary to weigh it exactly before it be put in as also the oyster shells.-
The curator sayd it would be worth trying what effect precipitation would haue vpon air by powring
certain liquors vpon Solutions to make precipitations. -- Mr Hooke Read a paper of his con-
cerning arithmetick instruments as well those that haue been made vpon the principle of the Rhabdologie as
that other Lately shown by Mor Leibnitz. and promised one of his own inuention of better performance
Orderd that this paper be Registred. [grew about Roots [Bocconj a Sicilia petrifactions. [capn. Hebert Shelfishes in
miorca Rocks. also Blubbers. de Grafs book. Flamsted about . Sr Sam Morland arithmetick booke.
[In margin]30.   May. 14. Mr Boyles liquor tinging Siluer &c. Dr Needhams report of De Grafs booke. -- mr Hooke made an expt. with the air
formerly produced in a bladder by the operatio of Aq: fortis upon oyster shells. having first tryed how long a slender white
wax candle would burne with common air, which it did in one Glasse During the time of sometimes 17 sometimes
20 or 21 vibrations of a pendulum of about a second. in another bigger glasse during the time of 55 such
vibrations. whereas the factitious air being by a certain contriuance Squeezed out into the bigger glasse
yet soe that some of the common air remained in it, the said wax candle burnt in it only 45 such vi
brations. The Expt being not accurate enough, The Curator was desired to make another apparatus for a
better tryall. It was moued againe that some Experiments might be made to produce air fit for Respi
ration, when mr Boyle suggested to make that tryall with corall & vineger.
May 21. Bocconjs curiositys viewed. [malphigis Letter about Plants & Pictures shining in the Dark. The Curator
[In margin]32   was called vpon for an Expt. which being not Ready it was Remitted to the next meeting.
[In margin]33   May 28. The Expet. of Generating air with aq: fortis & oyster shells pounded was made again, which being done
and a wax candle hauing burnt in the comon air of a glasse vessell sometimes 37 sometimes 40 or 45 vibrations
of a pendulu of about 3 foot long. the same Candle put in the vessell filld with the factitious air would not Burn in it
but only about an inch beneath the mouth of the glasse, when the outward common air had Some communication

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