82 O. N. Rood—LHffect of mixing White and Colored Light. 
Under these circumstances it was found that the addition of 
white produced the changes indicated in the following table: 
Vermilion became somewhat purplish. | Cyan-blue became less greenish, more 
Orange became more red. bluish. 
Yellow became more orange. Cobalt-blue became more of a violet 
Greenish yellow was unchanged. lue. 
Yellowish green became more green.| Ultramarine (artificial) became more 
Green became more blue-green. iolet, 
Purple became less red, more violet. 
angles or sides of the triangle toward W; in point of fact, 
however, I find, as a result of the above-mentioned experi- 
Vv ments, that we advance in curves 
lines is along the line joining violet 
with its complement greenish yellow. 
The other lines are disposed symmet- 
BY Or FO Yer 
the amount of white light added, but increased in a slower 
ratio, which at present has not been accurately determined. 
For the explanation of the above mentioned phenomena, 
Briicke’s suggestion that white light contains a certain amount 
of unneutralized red light is evidently inapplicable, since the 
effects are such as would be produced by adding a quantity 
not of red but of violet light, and for the present I am not dis- 
— to assume that white light contains an excess of violet 
ight. The explanation offered by Aubert does not undertake 
to account for the changes produced in colors other than ultra- 
marine, and even in this case seems to me arbitrary ; neither 
ave I succeeded in framing any explanation in accordance 
with the theory of Young and Helmholtz which seems plausible. 
