matter, and as is possible to make it, I place a white sector of vari- able angle made of paper painted with pure sulphate sometimes it designates the special sensation that we of barytes. This sector may be rapidly revolved by experience at the sight of thelatter. The distinction be- means of an… … M. Chevreul terms ‘‘ contrast.” But this is not the Fig. 1—APPARATUS FOR STUDYING THE HARMONY OF is placed for a few seconds in front of the free eye, COLORS, : sole means. We shall evidently reach the same and a small bright green surface is made to appear result by coloring with a monochrome of…
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