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If you don't give your eyes a rest, they will get color-blind to a dead certainty. Do you think you will paint the whole place off the face of the earth, now that the other fellows have gone?" "I can't be bothered talking to you. Johnny. You'll make me throw something at you. Go away."
The guessing grew lively, John finally giving his verdict that the dress was "some sort of dark white," when Elizabeth saw Charles Stuart pause and read absorbedly. "It's your turn, Stuart," she cried, to gain time. "John's color-blind." Charles Stuart glanced up. It was no easy task this, examining Elizabeth's gown, under the fire of her eyes. "Another new dress," he said evasively.
None of the young men of the district were color-blind.
Ask the examinee to select and pick out from the heap all those skeins which appear to him to be of the same color, whether of lighter or darker shades. A color-blind person will select amongst others some of the confusion-colors, e.g., pink, yellow. A colored plate showing these should be hung up in the room. Any one who selects all the greens and no confusion-colors has normal color vision.
In America a man with a drop of colored blood in his veins is classed as a colored man; in Cuba a drop of white blood makes him a white man. The whites honor their own pigment in all South America, but in the United States count the negro blood as more important. In Tahiti all were color-blind. The amuraa maa was over in a few hours.
For half a century the astronomical world had based an impression on the innocent but mistaken evidence of a color-blind man respecting the tints of ink in a manuscript. About the middle of the nineteenth century other methods of measuring the sun's distance began to be developed which, it was quite possible, might prove as good as the observation in question.
He sauntered on again, evidently disgusted at our lack of appreciation. "He must be color-blind," I observed. Hephzy was more charitable. "I guess likely everybody's home things are best," she said. "I suppose this green-streaked water and those gray clouds do look bright and blue to him. We must make allowances, Hosy.
In a large class of students one is pretty sure to find some who are more or less color-blind. The common defects are for red and green. Place worsteds on a white background in a good light. Select, as a test color, a skein of light green color, such as would be obtained by mixing a pure green with white.
This occurred about forty-five years ago; since then we have signally changed all that! Delacroix, who was an enthusiast in color, was the leader of one school of his time, and was opposed by Ingres, who was so wanting in this regard that he was accused of being color-blind. Mme. Thurwanger had a curious experience with these artists.
For instance, if we find by psychological examination that an individual is color-blind for red and green sensations, we may at once conclude, without any real psychological analysis of the vocations, that he would be unfit for the railroad service or the naval service, in which red and green signals are of importance.
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