71

There was tryd the Expt. ordd. the Last Day concerning the Dilation of Bodys wth. . glutted wth . the weight of the
imployed was 3 and 3/4. wherewth was mixed half theweight of . the weight of the glasse ball in the air was 5 drams
& 7 gr. and of the same in alone was 100 gr. and of the same in the mixture was 12 gr. the curator was orderd to
bring in the next meeting a full account of this tryall in writing. The same was orderd to try in priuate the Expt
of the floridnesse of Blood when passed from the right ventricle of the Heart to the Left through the Lungs.
& Dr King was desired to Ioyne wth him in the making the Expt. (Beals letter about the variation of the needle
obserued by Sturmy. it was desired the same obseruations should be made here in Iune and to obserue the Solstices)
to the Doing of which the Pt. Sr P Neil. Mr Ball & Mr Hook were particuarly desired to attend. (D Coxes scheme for
composing a history of Vegetables. to be read next meeting. mr Skippon said mr wray had with much of this subiect
At this meeting there was also tryd the expt. of precipitating the in the . by putting in some white salt but in
this short space of time it did not precipitate. It was orderd that this tryall and the statick expt. should be prese
sented the next Day. as also that the Rarefying engine should be brought hither & the expts. formerly proposd tryed therein.
Iune. 4. 1668. Iames Gregory presented Angelj de infinitis spiral: Eschinards Optic: & centuria Prob: optic: cassini demacalis in
et Ephem: Satellitum. et Ephem mot . & Reuol: circa Axem /&./ spina coelestis. et Riccij exercitatio geometrica -
Dr. King acc: of Anat expts.) Dan Coxes Paper Read) Stubs obseruations Read). Boyles portable Baroscope to be made.
mr. Boyles portable Barosc: to be made) The Curator not being present the expts. appointed for this Day were referred to the
next meeting. vizt. to mix Salt wth water & see how much it will be heauier, and for performing it to weigh salt in oyle
of turpentine. and by knowing the difference of the weight of these 2 liquors to know how much the salt that is
imbibed in water weighs in water. 2 mixing & Iron. 3 precip: out of by salt. 4. Expt. in Air pump wth glowormes
5. Expt. about floridnesse of Blood (Ball to giue his Obs: of Hook: eclip of the moon. & variation of the needle. magalottj letter
of Depriuing a dog of sense & motion.
Iune 11. 1668. S R Southwell 50ll towards Colledge) mr Hooke brough in a written account of the seed of mosse by him Ob
serued to be of that Exceeding smalnesse that about 770 millions are required to make the weight of one graine
the method of computing whereof he explained to the company. the paper was orderd to be registred (mr Ray promisd to
assist D Cox) Mr Hook suggested that it was worth inquiry whether there were any values in Plants. which he
conceiued to be very nessary for conueying the Iuice of plants tree sometimes vp to the height of 200. 300 &
more feet. which he saw not how it could be performed wthout values as well as motion. The same brought
in a written account to shew the Dilation of bodys whereby they are made to fill a larger space then they
did before not only when they are hot, but perfectly cold, It was orderd to be registred. There was made an Expt
of the porousnesse of sand being first well shaken & prest together, to see how much water it would take in
afterwards. the sand was white howr glasse sand and the quantity here vsed weighed 9 6 the sand and water
imbibed weighed together 11 1 1/2. the Curator was orderd to bring in writing a full account of this expt.
and to try the like about the porousnesse of Ashes the next day, as also the expt. of weighing a Sal gem in oyle of
turpentine (about Steno expt.) the Rarefying engine to be brought to Arund house) The curator was put in mind
to make the Expt. of the floridnesse of the Blood in the arterys after it has past the Lungs. (mr Slingsby Indian Gold Co
loured skeynes)
Iune 18.1668. (Sr R Southwell Skul couerd wth mosse.) Glanuils Plus Vltra) Godelphin to get Spanish books about mines
There were made 2 Expts. 1 of mixing Sal gem wth water to see how much it would grow heauier therby, There was taken one

part of Sal Gem & 4 parts of water by weight. The curator was orderd to calcu late the proportions of these weights, and to bring in a written Account of the whole at the next meeting, as also that of another expt. formerly made of this nature.

The salt weighed in air - - - 1 3/4 10 1/2 The same in oyl of turpent. 3/4 . 47. The glasse ball in the mixture of salt and water weighed 1/4. 17 1/2 The same in oyle of turpentine 1/4. 53 1/2

[In margin]Vz  2. The 2[d]. was of a new kind of Barometer filld partly wth. quicksiluer partly
with water, to the end that the variations thereof may be rendred more sensible than they are in those glasses
that are filled with mercury alone. The curator was desired to bring in the Description of this Barometer
in writing. It was mentiond by the Curator that the liquor in this kind of Barometer will some
rise to 34 inches of which he did not yet see the Reason. The president was desired to get such a Baro
meter as this prepared and to make obseruations with it which his Lop: promised to doe. -
(Boyle barometers of & . & . &c.) The smallnesse of mosse seed being again spoken of and the Curator
desired that he would further explaine what method he vsed in computing that the weight of the aboue 777 millions
of those seeds makes noe more than the weight of one graine. added to what he had already sayd in his written
account about it, that he reckoned 2 inches square of venice paper did weigh one graine and the Length
of 30 of the seeds layd close by one another did aequall the thicknesse of Venice paper, which being calculated
after the manner described in his written account would amount to the sum aboue mentiond - mr Hooke
being asked what kind of mosse it was the seed whereof he had thus examined, said it was of that sort which he
had Described in his micrography. Mr Howard was desired to bring in what capillary plants he had for mr Hook
to view with a microscope the backs of the Leaues of them to obserue what substances they are that grow vpon them
Dr. Wilkins suggested that the Curator might be orderd to try whether he could by the meanes of the mosse seeds he
had produced make mosse grow on a dead mans skull. (mention about Anatomicall room)
Iune. 25. 1668. The curator brought in a microscopicall Obseruation concerning the texture of wood
tending to shew the manner of the Iuices ascending to the top of tall trees by a kind of Values but the com
pany not being satisfyd wth the Observation made this day by a microscope of a peice of wood It was
orderd that It should be referred to a cleerer day, and that a better microscope should be prouided for that purpose
as also that the curator should look on a Bulrush to obserue how the texture of that appears to be -
The Prest. Related that he had made an Expt. wth & water. in a tube after the torrecellian way and found that the
proportion of to water was not as 14 to 1. but as 9 to 1. his Lp. was desired to obserue whether in this case there were
not a bubble of air at the top of the Barometer. There was made an Expt in the Rarefying engine with a sloworme
which vpon exsuccion did swell (earth instead of soap) Description of the Ruines of Ariconium. Ludus Helmonty
Heuelius Letter about his cometography. which he submitted to their Iudgment, this Letter conteining some exceptions
[In margin]Vz.   to what had been formerly communicated to the said mr Heuelius by mr Hook about telescope sights as much better
then the common ones for quadrants sextants Leuells, and especially for all kinds of celestiall obseruations
It was orderd that a Coppy of that part of the Letter should be giuen to mr Hook to declare himself further about it.

Ref: CELL/RS/HF_073  © Centre for Editing Lives and Letters