429
Apr: 8. 1680
The Society Did not meet.
Ap. 15. 1680.
It being Ea
ster week very few mett. But
S
r. Christopher the vice P
t. taking the chair seuerall Letters from
correspondents were Read.
The first was A Letter of Mon
r. Leibnitz to M
r. Haak Dated in
February La
st from Hannouer. giuing an account of his Princes De
signe of
making a suruey of his own countrey. Enquiryng concerning the vndertaking of D
r.
Pelle & especially after his way of Resoluing Equations by A table of
signes.
Answering some propo
sitions made to him by M
r. Hooke, as particularly about his
arithmeticall In
strument &
the Bis
p. of chesters Vniversall character & lan
guage. And hinting at an invention of his, w
ch he suppo
sed much more v
sefull
for the Improuing Reason. he mentions to haue by him vas arcanum Luminis perpetuj
Differing from all other
shining bodys. he Inquires concerning m
r Barnard & whether our
manu
scripts haue
the more of Apollonius then Barcellus has printed.
Vpon di
scour
sing concerning this part of his new Inuention, M
r. Hooke mentiond
that he had an inuention of that kind in seuerall other subiects be
sides Geome
try or Arithmetick.
The second Letter that was Read was another from
the same, M
r. Leibnitz
to D
r. Grew Dated from Hannouer
the 9
th. of march 1680: /wherein he/ De
sir
inges seuerall
things to be sent to Him /&/ sends word of D
r Volcamers making obseruations of
the Declination of
the needle. Of a book publi
shed by Ioh: Hallens called Introitus
ad nouam & Inauditam physicam, he supposes him to be one that affects my
s=
terys. of a ma
sse of Amber found Neer Hannouer. Of a great number of small
animalls found in the snow of a mountaine. Of one Beatridge promi
sing a
Powder that at a certaine time will take fire. Of a Di
scouery of his that the
Thermometer ought to be Diuided in a mu
sicall progre
ssion. that he has almost
perfected his Arithmeticall engine. that Tabors febrifuge is made of
the Ie
suits bark.
He inquires about Dying & tinging Gla
sse red. that he had seen S
r. S Moorlands but
doubts his conclu
sion
that De
sires to be Informd w
t.
the R: So: are doing.
Herevpon some Di
scour
ses were occa
sioned about Dying and tinging of Gla
sse
and of the Excellency of the Flint Gla
sse now made in England.
as al
so about the hardne
sse of Pretious Stones & the way of Slitting them
some by the knock of Hammer others by a wire Dippd in vineger &
sprinkled w
th. Diamant powder of w
ch. D
r. Crone vndertooke to bring in a
more full account.
The 3
d. Letter was one from M
r Iobe Ludolphus to M
r. Hooke Dated from
Franckfort Decemb: 31. 1679. Giuing an Account that D
r. Clauders Inuen
tion of Preseruing Dead bodys was now in the Pre
sse. And that he would for
the future very gladly continue his correspondence for the future &
c
omunicate what he met w
th. considerable in Geographicall matters
There were seuerall other Letters & papers to be read, but the Society adiourned them
to the next meeting.
Ref: CELL/RS/HF_431 © Centre for Editing Lives and Letters
