364 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



measure or quantity is doubled. I shall, presently, speak of measure 

 as an element of balance. 



When it comes to the consideration of color intervals we have to 

 think not only of the interval between one color and another in the 

 spectrum scale, but, also, of the interval between each color and the neu- 

 tral in which it disappears and is lost to vision. Take red, for example, 

 in its greatest possible intensity, an intensity limited by the pigment 

 material which we possess. This red is contrasted not only with its 

 neighbors in the scale of colors, purple on the one hand and yellow on 

 the other, but it is contrasted with itself in various degrees of neutraliza- 

 tion. Establishing the greatest possible intensity of red on the one hand 

 and a perfect neutrality on the other, both in the same value, and using 

 for measure and for shape the circle of half an inch radius, make a scale 

 of nine tones of red, the extremes of intensity and neutrality being 

 included in the scale. What has been said of the other scales may be 

 said of this one ; a repetition is unnecessary. 



We have considered the scale of values and the scale of colors sepa- 

 rately. Now let us put the two scales together. The values being 

 neutrals in every case, we can set complementary scales of colors on 

 the right and left of the scale of values. That will give us two scales of 

 colors, and between them the scale of values, as follows : — 



Following this diagram, put in the place of the value numbers values 

 of neutral color, moving from the central neutral up towards light (white) 



