be as follows:—
Blue.
Blue-red.
Red.
Yellow-red.
Yellow.
216.
The yellow and blue, in the first case (214), can by degrees meet so fully, that the two colours blend entirely in green, and the order will then be,
Yellow-red.
Green.
Blue-red.
In the second case (215), under similar circumstances, we see only
Blue.
Red.
Yellow.
This appearance is best exhibited by refracting the bars