h 
22 
ample ; and it is a general rule of Nature, in diluting colours, to give 
them a bluer cast to our senses, whether in prismatic or material 
colours, as we shall find upon a fair trial. The broader line h. is less 
pale, and has four colours more distinct, blending into each other a 
little : i. shows five tints distinctly and vividly, although somewhat 
blended. 
fYellow 
Thus g has < Red 
LBlue. 
fYellow 
Red 
Violet 
.Blue. 
'Yellow 
Red 
<; Violet 
Indigo 
[Blue. 
The gradual blending or passage from one to another is generally 
too indistinct for use, excepting on some occasions. The yellow and 
blue, that give a broader appearance in colours than the black pro- 
ducing them, have a share or partake of the white, as it must be 
remembered that they depend on both. Thus it produces by means 
of the light on one side two proportions of yellow, and on the other 
one of blue. I have before shown that a given proportion of 
light or dark produces a given quantity or force of tint or colour. 
In the present scheme, in which the mixing is to be more perfectly 
understood, I have endeavoured to place the black marks in such a 
position, that it may be seen what tints become mixed with others 
by leaving a portion of each unmixed, llie upper five figures, 
Tab. 4. c. show the quantity of black that produces those colours 
represented in the lower five figures Tab. 4. d. c. 1 *, therefore, by the 
* It was thought convenient, to prevent confusion in exanainiog the subject with the 
