113 
You 
will 
find 
that 
this 
experiment 
wili 
instruct you, not only in the principles of light 
and shade, but also of colours; for that there is 
a corresponding hue with respect to colours is 
not to be disputed. In order to demonstrate 
this, place in the ball which you have illuminated, 
the prismatic colours, suiting their hues to those 
of the tints. Yellow will answer to the focus of 
illumination, 
and 
the 
other 
secondary 
and 
their proper places. 
side of a group or 
primary hues will fall info 
Hence, on the enlightened 
figure, you may lay yellow, orange, red, and then 
violet, but never on the side where the light 
recedes. On that side must qome the other 
prismatic colours in their natural orcler. Yellow 
must pass to green, the green to blue, and the 
blue to purple. The primary colours of yellow, 
orange, and red, are the Warm colours, and 
belong to the illuminated side of objects; the 
violet is the intermediate, and green, blue, and 
purple are the cold colours, and Vbelong 
retiring parts of your composition.  
t0 
the 
cc OH 
the 
same 
principle, 
and 
in 
the 
S3111 6 
order-, 
must 
be 
placed the tints which 
Compose