119

Dec : 13 : 1677 (1) Entred

The President being come. MrBarrington and Mr. Hall were
sworne of the Councill & Dr. Grew was sworn as Secretary.
The President by his seruant sent in 3 new standishes and
27 folds of paper wth. /2./.Penknifs Pens &c -
Sr. Peter Colleton being this Day Ballotted was chosen by the
suffrages of 26 wthout a negatiue
Mr. Herbert Propounded the Last Day by Dr. Whistler
being ballotted was chosen by thesuffrage of the like number
The minutes of the Last Day were read wherevpon A debate arose
concerning the Barometer and cause of the phenomena of the
Barometer And whether the same altitude of the did always fore
shew the same constitution of Weather.
Dr. Holder Related that Dr. Vossius had indeauourd to giue a reason
of those appearances from the Different natures of the Air blowing from
the seas or from the Land and that the former were Light & the Later hea
=uy.
mr. Hooke explaind the manner how the air at sometimes pressed more
sometimes Lesse and that was from the Reall accesse and accretion
of vapours Raised vp in the forme of Air, which whilst intimate
ly mixed wth. the air might augment the bulk as also the specifick
Grauity of the air soe long till by a second sort of vapours all those
other become precipitated or condensed into the forme of water
whereby the air out of wch. they areseparated becomes lighter in specie
and also the altitude of the Aeriall Cylinder becomes Lower. for the
.. . . Grauitation of any fluid vpon /an equall/.. . . bottom of the conteining
vessell is always in a proportion compounded first of the specifique
grauity of the fluid itself & secondly of the perpendicular alti
tude of the said grauitating fluids. Of this he affirmd he had
made out formerly to this Society by many experiments as their Iournal
/book would shew/ wth this Sr. Ionas More concurred and Explained the same in a tun
filled wth liquor wherein the grauitation or pressure against the
bottom or any .. . . part thereof was alway equall to the weight
of a cylinder /equall to the Bottomof the ve/ of that liquor and vpon where it toucheth the body
Vpon this Dr. Whistler made seuerall objections but vpon the further explication of
the manner of making the Experiments he was Satisfyed of the theory

Ref: CELL/RS/HF_121  © Centre for Editing Lives and Letters