OCR Text |
Show Natural Colored Silk. Recent experiments in France have shown that the yellow and green colors col-ors possessed by the silk spun by certain caterpillars are due to coloring color-ing matter derived from the food, and passed through the blood of the spinners. spin-ners. By impregnating leaves with artificial colors the experimenters caused some species of caterpillars to produce silk of bright orange-yellow and fine rose hues. By the aid of the spectroscope the presence and nature of colored pigments in the blood of the little animals was established. |