f ) 
cafy Way to find in Propp 6, 8, i z. which are in the 
fecond Sedion. And by this means he Solves feveral Pro- 
bleras in Perfpedive, which it’is not poflible to do by the 
common Way, acleaft wichouta great deal of Difficulty, 
and a great Confufion of Lines. And by this Method 
he {hews how the compleat Representations of any pro- 
pofed Figures may be found,' having given the Represen- 
tation only of lome principal parts of them. The Se- 
cond Sedion, contains feveral Propofitions to thatpurpofe* 
(hewing how to find the vanilhing Points and Lines of 
propofed Lines and Planes, according to the feveral Cir- 
cumftances propofed ; and by the means of them, howto 
find the Representation of any given Figure. In the End 
oftthis Sedion there are Some Examples, in the Defcripti- 
on of the regular solids and fome other Figures. 
Tfie third Sedion (hew? how to find the Reprefenta- 
tilpin of t^e. Shadows of all Objeds- 
* Tjie fourth Se&ion (hews how to find the Reprefentati- 
ons of the Reflexions of Figures made by polifh’d Planes. 
The fifth Sedion contains a few Propofitions relating 
to the inverSe Method of Perfpedive ; or the manner of 
examining a Pidure already drawn; fo as to find out 
what Point the Pidure is to be feen from, or having that 
given, to find what the Figures are which are defcribed 
on the Pidure. 
Our Author has obferved that there may be a very 
good Expedient made ufe of in painting of large Rooms 
and Churches, which is drawn from the Nature of thofe 
Rays which produce the Vanilhing Points. This not being ; 
mention’d in the Book it Self, he thinks it not improper to 
take notice of it here : The Expedient is this, Having fome 
way or other found the Reprefentation of one Point of a < 
Line that is wanted in the Pidure, to find the whole Line, 
pafs a Thread ftretch’d through the place of the Speda- 
tor’s Eye, in a Dirediou parallel to the Diredion theori- 
