VIBRATION
their tenacity in clinging to the traditional recipe of the brown rub-in. And although this was allowed to dry thoroughly and was then completely painted over with pearly tones that were true to nature, the browns are now beginning to strike through to the surface—to the serious detriment of some of the finest pictures on earth.
Now when the fullest acknowledgment has been made of our stupendous indebtedness to the discoverers of prismatic painting, it will be wise for us to recognize the limitations of the system; to admit that there are very many effects in which it must be used with extreme caution, and others in which it had best not be employed at all. If we frankly envisage the fact that its chief function is to endow our dead pigments with life, with the power to convey in a picture the joyous impression of dancing light,
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