(504^ ) 
6. De SeBkne line a reBdt extremh & mUik fAtipm, 
7» De Polygonis reguUrihm» 
8. De ^.^quatione iine(Z ReUdt, & Anh circfifi. 
^, De Tangent e arsm gradmm%'i\* 
10. De Prudentla adftudiHrn GeometrU neceffaria, 
11. De latere Icof^edrL 
12. De ^^adramra Circuih 
13. De natura Libr<£. t r 
A Reply to thefe Animadverfions, being cxpeded from the Perfos 
concerned, will probably be inferred in the next following i\r«;5^^(?r. 
ll.OPTI^E de PORTRAITVRE & PEINTVRE, eontenm k 
PerJpeEiive SfecuUtive & Prmque accmplie.&c.Par Gregoire^HarcE, 
Deffeignatenr & Gravenr Ordinaire de U Mdfon du Roy^ & de I'Acde- 
mie Royde de Peinture & SeulpHre, A Paris, 1670. In Ed. 
T His Elegant volume in Trench dcdareth the chief aim of its Au- 
thor in the conapofition thereof to have been, to contribute what 
he could to the iBftruaion and improvement of youth, ftudious of 
thefe excellent Arts,and groundedly to teach them the Rules and o- 
ther means,that are really ufeful and abfo lately neceffary to them in 
the fame, fo that they may both make ufe of ihtm, and difcern them 
from abundance of falfc anjiimpef fed ones,that,he efteeras,have been 
delivered to them injm^of the Treatifes hitherto made about this 
In the performance of which, he divides this Volume into two 
parts : The Eirp contains the accoraplifli't f for fo he calls it) PrM- 
W Perfpeftive, toreprefent the fumptuous Architedures of the moft 
magnificent Buildings in Perfpeaive,by two wayes • x}^t former M^^r- 
mg the means to arrive to a conripleat exadnefs, but fuch as arc only 
taught to inform the underftanding, and not to be praftifed, if yoa 
wiy not ; ^^Sit lmer containing the fliorteft and eafieft means of all that 
hive been publiiJi*t hitherto ^ and that for general praftifc, and all 
without uling any point of diftance nor Geometric plane. 
The part difcourfcs of Speculative Perfpedive ^ W-c. oftbc 
Demonftrations and Explications of the Fundamental Secrets of the 
Rules or Means contained in the Firft part ^ together with the rnoft 
Curious and moft Confiderable f^ueftions, that have been hitherto 
propofed upon this argument of Pourtraiture and Fidure, with tbsir 
Solutions. 
About the ead of this Book the Author, annexes an Accompt ana 
fome Remarqucsof his, concerning the Defign of M. Defrrgties^ 
Rough-draught of his Treatife of Cs;?^'5^^^/, siiiitulcd Lejfons^eTenc 
We muft not omit to take notice here^th^t in cfa€ Extrad of the r^^* 
mW|^# given to this Book ("pag. 159. ) mention is made of two other 
