(141) 
made up of ill-drawn Confequences^ and it being alfo certain, that he that 
is not able to difcovev fuch vices by the fole Light of nature, will neither 
be able, to learn and apply thcfe Rules that are taught to deted: them. 
Proceeding to deliver the Rules of true Method^ hefirft recommends the 
four celebrated ones left by Des-Cartes in his Viffertation ds Methodo^d.'i ve- 
ry ufeful to,avoid Error in the acquifition of Sciencesi,and then he reprefents 
with an high encomium the way ufcd by Geometricians for Demonftration, 
co mprifed in thefe/iT^e Rules •? 
I, Nihil in termini^ ohfcurum & £quivomm relinqHere^rjpiod non definiatw\ 
2 .In defimtionibus terminos ufurpare velperfedc notos^vel friks explicatoj\ 
3,, Nuhim axioma ponere quod non fit evidentijjimum, 
4. Omnes Fropofitiones Juh'obfcuras probare ope Vefinitonum pr£mijfarum^ 
Jxiomatum concejjorum^ frofofttionum demonfir atarum ^vel denique ipfa rei^ 
de qua agitur\ Conftrucfione^ ubi quid hciQn^nm proponitur. - 
5. Ntinquam abuti terminorum Ambiguitate^yion juffeUis^faltem mentali^ 
ter^ Vefinitionibus^ qux illos refiringunt & explicant. 
Yet to this Method he fubjoyns an Advertifement concerning forne De- 
feats that are obvious even in that Method of Geometricians h of which he 
enumerates thtfe iix : i. Magis labor are de Certitudine quam 'Evldenttaydc^^ 
que IntelleUu convincendo quam illummando. 2,Ea probare qu£ probaiione non 
egent, 3 . Vemonfirareper impofjibile^.Q^non per propria rei principia^ fid per 
aliquod^fi res aliter fe haberet^ inde fecuturum abfurdunu 'Demonflrare 
per aliena & remota. '^.Non obfervare rerum ordinem, 6. Non adhihere divif- 
cnes & partitio} er. All which how 'tis made out by Inftances, may appear 
in the Book it lelf 
Some Animadverfions upon the Latin Verfion, made by C, S. of the FhiL 
iranfadions h,i66'^.i666,i66j 16685 punted J mjierdam by Hen- 
ry mdflbeodore Boom : Which Reflections iince they chiefly concern For- 
raigners, it was thought moll proper to give them here in Latin, 
NON fine gravi ^gritudine animiy operam^ilIi^{jU£ ^o,y c^.p,2 2 6p.bor7m o- 
pufculorumextat^ geminam denuofufeipit eorundem Anihor Anglicus i 
edque tanto graviori^ qvodvix id fieri ab eopojjit fne (ffenfone liri^cujns alio- 
quin eruditionem £liimat.Non una equidem ratio ipfum adegit ad injucuHdam 
banc provinciam denuo fubeundam cnm nonprivata duntaxat jua. f: d ipffi" 
ma Societatis Regis exijiimatio iddepofcat, Etenim^ ut a pofieriori exordiar^ 
perperam omnino Verfionem banc Latinam srnavit Jnterpres^vel Bibliopola^vsl 
uterque^falfo illo L'itulo^kddL Philofophica Societatis Regia?, ckm manifejto 
ajfuantur h£ voces f Societatis ¥<cgix) qu£ in kn^koOpere nequaquam ex- 
tant'-, cnmque tantkmabfit^kdti h£c diet poffe Societatis Regise , ut pla^raque 
potiks^ (ne dicam omniaj in his Opuf cults comprehenfi , A^ia fint virorum 
particularimn^tum extra ttnn mtX2iAngliam philofophantium\ckm -denique f- 
dempojjjm appeUare interpretis^me fat is mature difertis litter is eum manuijff^ 
neutiquam ea effe did£ Societatitribuenda^ utpote qu£ non modo nihil eorum 
compofuerit^ fed& confcribendishujufmodi Mifcellaneis dignitatem juam pro- 
ftituere dedignetur : ^ihus accedn^qtibd ipf£ Authoris AngUci T>edicationes 
qtiibus opufcula h^c^diverfrs amis editct^tum laudift<e Societati^ turn NQbilifi- 
