ROSS. 



DESIGN AS A SCIENCE. 



369 



This system would seem to be a particularly natural and proper arrange- 

 ment of the values and the colors, for, if you throw the spectrum on 

 white paper in sunlight the colors are seen all pale in the white light, 

 ecpially intense so far as you can see them, but with the differences of 

 value or luminosity which are indicated in the diagram. If you throw 

 the spectrum on white paper in shadow (half light), you see the colors in 

 equal intensity and in the greatest intensity, with the same dififcu'ences of 

 luminosity. If you throw the spectrum on black paper in shadow, you 

 will observe the same eijual intensity of colors, so far as you can see 

 them, and the same differences of luminosity, but the whole spectrum 

 is disappearing in neutral darkness. This system of color-values or tones 

 VOL. XXXVI. — 24 



