they have always agreed with the Sun. As to the Printing of 
the Fjgure of my New Watch , I fhall defer that yet a while : but 
it fhall in xvvc appear with all the Demonftrations thereof, toge- 
ther with a IreatiCe of Pendnlnms. written by me fome days CmcQ^ 
which is of a very fubtile Speculation 
The Char aSier^ lately publifhe J bejond theSeas^of m Eminent 
Perfon^ not long fence dead at Tlioloufe , where he was a 
Councellor of Parliament. 
It is the defervedly famous Monfieur de Fermat ^ who was, 
( faith the Author of the Letter ) one ot^ the moft Excellent 
Men of this Age, a Gemus fo univerfal, and of fo vafl: an ex- 
tent, that if very knowing and learned Men had not given 
teftimony of his extraordinary merit, what with truth can be 
faid of him^ would hardly be believed. He entertained a con* 
ftant correlpondence with many of the moft Ulufrrious Mathe- 
maticians o£ Europe ^ and did excel in all the parts of Mathema- 
tical Science ; a Teftimony whereof he hath left behind him io 
the following Books. 
A Method for the Quadrature of Parabolas of all degrees. 
A Book De Maximis Minimis 5 which ferveth not only for 
the determination of Problems of Plains and Solids^ but alfb 
for the invention of Tangents and Curve Lines ^ and of the Centres 
of Gravity in Solids 5 and likewife for Numerical Queftions. 
An Introduftion to the Doftrineof Plains and ^Sv/zW/^ which 
isanw^/^^^/zr^/Treatifej concerning thefolution of Plains and 
Solids 3 which had been fecn (as the Advertifer affirmsj before 
Monfieur D^j- C^rfcj had publifti'd any thing upon thisSubjedL 
ATreatife Ve ContaUihus sphivricis ^ where he hath demon- 
ftrated in Solids^ what Mr. Fiet^ Mafter of Rcquefts, had but 
demonftrated in Plains, 
Another Treatife, wherein he eftablilhethand demonftrateth 
the two Books of ApoIIonius Perg^us^ of Plains, 
And a General Method for the dimenfion of Curve Lines ^ 
Befides, having aperfcft knowledge in Antiquity, he wascon- 
fulted from all parts upon the difficulties that did emerge there- 
in ^ he hath explained abundance of obfcure pLnccs ^ that are 
found 
