( 5 * 9 ) 
tHe laft year *7 found no more but i o . minutes * m Letter was 
on the fame Meridian. Upon which having written this prefent 
lately applied, fince the receipt of the Letter, year ‘ 
the fame" wo Needles * me thinks, the Declination is yet left, 
than the laft year. But this I can affine you, that the Declina- 
tion is yet fome minutes towards the * By che favour of the Author, 
Mad at leaft at Paris. So that you it is not conclufive, that becaufe 
5 „ ™ rlnnKf * nf the the Declination is^yet fomewhat 
may, upon my word, doubt or tne towarJ ,, th< , / t p „ i( , hat 
Obfervation of your friend, whom per- therefore it muftbe fo at ton- 
haps the Meridian , or the Needle, or the : Since >* known . here, that 
even the Partition of white-bale 
Contraction and Divilion ot his Com- ^ ets fr<ito that o( Lime-hd/er 
pafs may have deceived, to a degree and which two places are but 4. Eng- 
- k 1/.VT - 1 fL .'u:JLU*i- n ++ LhM. lifh miles, or thereabout; diftant 
a ^//North-weft, which heat thepre- 
fent affignes toth e Declination. But ! / 
doubt not, but in 12 or 15 years it will be found true what he 
affirms, as I have prognosticated by my Hypothecs, which ma- 
ker h the Declination to vary a degree every {even or eight 
^ This is, what 1 : had to return to the Letter, which I with 
might deferve to be prefented to your lllufirions Society , and 
contribute fomething to the difeovery of fo many admirable 
vertues lodged in this Stone, and principally to the finding out 
of the Caufe of this Variation • for which I have already made 
fome attempt, and propofed my thoughts in a Divert ation de 
Latitudine Parefienfi & Magnet is Dechnatione , which M. du Ha - 
mel caufed to be printed Anno 1660. with his Ajlronomia Phy- 
(tea. I (hall be very glad, to learn the fentiment of your Learn- 
ed Philofophers thereupon, and what caufe they fufpedt there 
is of fo fingular an efFeft. I could difeourfe to you of other par- 
ticulars touching the Proprieties of the Load- (lone, and especial- 
ly of a remarkable one., 1 havedifeover’d, and which, if I am 
not deceived, fubverts that Theory , which undertakes to expli- 
cate all thefe effe<fts by th eParticuU a $ but I refervethat, 
fc another occafion,.. 
