433

Aprill the 29.1680

Mr. Henshaw the VicePt. tooke the chair

The minutes of the 22th. Instant were read.

After wch. Dr. Tison produced a Draught of the 3 teeth set in a socket
as also of a stone taken out of the kidney by the same Person

He promised to Draw vp an account thereof In writing.
Dr. Wallis Read A large Discourse of His about the Paschall tables
shewing the Reason of the many mistakes and Diuersitys of the
opinion of Authours about ^/assigning/ the true time of Easter, and As also
shewing a way how the same is to be rectifyed.

Hauing Read about a 3d of the Discourse, and the time being
well spent, after he had Received the thanks of the Society
for this comunication he was Desired to Impart the Remainder
some other Day.

Dr. Iacobus Pighius veronensis, medicus Caesareus & Anatomie
Professor Primarius Paduaiensis being formerly Proposed by
Dr. Brown was now at his Desire Put to the Ballot and Elec
=ted fellow of the Society.

Captaine Wood formerly chosen being called in & hauing sub=
scribed his name in the Statute book of the Society was ad
mitted Fellow of this Society by the vicePt

A letter from Will Ball Esq Dated from mamhead in
Deauonhire Apr: 24. 1680 Directed to mr Hooke was Read
Giuing an account of some magneticall obseruations he
had Already made and of his Intentions of making Diuers o
other Instruments & tryalls, as particularly of making a mag
neticall Needle of ten foot in Length and another of 20 foot
in Length in order to Examine the variation, of the Directiue
virtue. As also mention is made of An observation of the variation
neer the Sound.

Herevpon, Dr. Wallis mentiond some opinions about the variation of
the Latitude of Places. Mr. Hooke said that Mr. Pierre Petit
had writ a Discourse of that subiect indeauouring to make it
probable. It was conceiued that the cause of this opinion might be
Imperfect Obseruations made of the Latitude of Places by Differ[ent]
authour, and that till we were better assured of the Accuraten[ess]
of Instruments & Obseruation nothing could be concluded abou[t]
that controuersy.

Ref: CELL/RS/HF_435  © Centre for Editing Lives and Letters