LOOKING-GLASS. 
139 
him ; becaufe a paffion for any branch of knowledge 
produces the greateft proficiency conducive to ge- 
neral improvements in liberal arts and profellions. 
The art of drawing profiles, or fhadows, cannot 
be too ftrongiy recommended to a young Phyfiog- 
nomift, as one of the beft methods of acquiring a 
juft idea of chara6feriil;ical outlines to be drawn 
exaftly fbr his models. 
As this exadtitude depeiMs on the manner of 
forming thefe fketches .from the reflexion of a face, 
always weak upon pa^r, a folar microfcope is 
ufed to remedy the defedf, while the head to be 
drawn is placed, free and eafy, as clofe to the wail 
as pofiibJe. 
For this purpofe, a board, hollow below, isr 
placed upon the flioulder, four feet five to feven 
inches above the ground, and covered with foft 
paper faftened and feale*d v\dth wax over the 
holes in the wood. 
Another more cony^iient method for drawing 
fliades is, by means ora*tnirrour, hollowed below/ 
and covered wdth oil-cloth. The fliade is thus 
quickly drawn, and when it is taken from the 
frame the lines are retouched wherever the refledf- 
ed outlines are too weakly imprelfed. Then it may 
be diminifhed to a miniature, by avoiding to blunt 
the edges, or diforder the angles, of this pidture. 
One of thefe diminutive copies is blackened, and 
the fecond is preferved blank, for keeping the mea- 
fure 
