Cold Light

Experimenters on both sides of the Atlantic are working to produce " cold " light, i. e., illuminating substances with a minimum of heat. Professor E. Newton Harvey, of Princeton, and Dr. W. R. Amberson, of the Nela Research Laboratories, Cleveland, have isolated " luciferin " and " luciferase," the phosphorescent substances which produce the glow of fireflies and similar animals. They hope to manufacture them artificially in quantity.