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whicli the leaft lines^re to be drawn 5 which he hath extended* 
and applyed to thofc infinite forts of other PdrahUs, 
chap, 7, Treats Figurarum dimenftoneex datoCentro t/£- 
qmlthrii: This he faith is accurately handled by the Learned 
already 5 Aliquot tamen modos adjcribit^ m dtfficiles^ ita nec 
imuHes ad inve[Hgmda zAEquilibrii Centra: which may be ap- 
plyed to good ufe5 for, in r.ny Curve, if there be Ordinates e- 
nough given, ftanding eredi at an equal pirallel diftanccj you 
may approachthe ^m^and if by ayd thereof, you find the Cen- 
ter of Gravity , then do you obtain the meafure either of the 
Mmnd Solid^ or S f indie mzdt by the Rotation of tf .-e given Fi- 
gure, or of Hoofes raifed upon it as a Bafe. 
Chap. 8, The Author fheweth an eafie way of finding the 
Center of Gravity of an Hyperbolical Conoid, and that in order to 
ihe refolution of this Probleme^ Locum invenire, ad quern junt 
omnia Centra Conoidum Hjperholicarum^ quA fiunt ab HjperboUs 
in dato Cono recto feet is, ^ quorum Jxes (int Axi ejujdem Co-^ 
ni faralleli 5 which he finds to be an Hyperbole. 
chap. 9. He treats of the Center of Gravity of the Lunula oi 
Hippocrates chim^ and fticweth, that if Hippocrates had given 
that, as he did the ^adrature of the Lunula^ he had fquared 
the Circle, 
chap. 10. Treats of Arithmetical Problems, wherein hcaf- 
ferts, that JD/<?/>^^;^^/^^ was wont to folve Arithmetical QQ^Aions 
with great fubtilty, but ufeth numbers only , whereas the fame 
may often be more eafiiy and univerfally folv'd by Algebra^ and 
takes for eKarapies^the third Queftion of the Fourth Book^which 
he reformeS; "nd reduceth divers of the like kind, that Bachet hath 
added., to one Propofition and Relolution 5 the 44th of the 
Foufth Book of the fame Biophantm^ which being folved with 
much trouble 5 hf (heweth to have abriefe Anal^fis-^ the 13 th 
of the third ^'ook^and the 36th of the fourth Book, by reafon 
of the Ukeneo of it's Operation with the former. 
Thus we have given an account of the Authois Book. What 
Repute he hath among the Learned, needs not to beinfiftedon. 
T 'le famous Pafchal or Dettonvile in a Letter to this A ufhor faith^ 
(to give it in ij^^/i/Jj)! believe, that, to make it known,that 'tis 
ToU) who hath tound (for Example^ this Parabola^ which is 
the 
