and that the overflowing of the Nile always happens at a certain 
day. f 
In the Laft, he alledges fome Relations, ferving to confirm 
his Opinion; Which are too longhere t6 inlift upon. 
BE P RIN C IP I IS- ET RAT 10 C IN AT ION E 
GEO ME TR A RZ) M 5 Contra Fajlum ProfeJJbrum Geometric; 
Authore 'Tboma Hobbes. It feems 5 that this Author is'angry 
with all Geometricians, burhitiifelf ; yea he plainly faith in ‘the 
dedication of his Book, that be invades the whole Nation of them; 
and unwilling, itfeems, to be call’d to an account for doing fo, 
He will acknowledge no judge of this Age; but is full of 
hopes, that pofterity will pronounce for him. Mean while he 
ventures to advance this Dilemma 5 Forum qui de iijdem rebus 
mecum aliquid ediderum , aut joins injanio Eao.autfilus non.infamo--, 
tertium enim non eft, nifi ( quoddicet forte aliquis ) infaniamus cm* 
nes . Doubtlefs ? one of thefe will be granted him. 
Book it felf, he profeifeSi that he doth not write 
it again!! Geometry , but Geometers and that his defign in it is, 
fo {hew, That there is no lefs uncertainty and falfity in the writ- 
ings of ‘Mathematicians, than there is inthofeof Natumlifh 
Moralifts, dec. though he judges, that Pbqficks,Ethich,Politic\s, 
if they were well demonitrated, would be as certain as the 
PI a thema tic ks . 
Attacking the Mathematical Principles as they are fount! in 
Books and withalHome Demonftrations,he takes to task iEucliT 
himfelf, mftead I of all, as the Matter of all Geometricians, and 
with him his beft interpreter, CUvius, examining in- the fir (l 
piace, the Prmctples of Euclid: Secondly, Declaring falfe, Whit 
is fiiperftru&ed upon them, whether by Euclid, ofCluvius or. 
any Geometer wh&tfoevev that hath made ufe of thofe or other 
( as he is pleafed to entitle them) falfe Principles. Thirdly , Pre- 
tending, that he means fo to combat all,boih Principles and De- 
monftrations, undertaken by him, as that he will fuhftitute-l.et- 
rc^t if r00m; ICaft lle IhwU feem to undermine the Sot- 
Tlfc 
