EXPERIMENT STATION RECORD, VOL. 10, NO. 2 



Action of Different Light Rays on the Coloration of Plan.s. 



i, Red-flowered crassula: (A) in sunlight; (B) in darkness. 2, Alternanthera amaena: (C) full 



radiation; (D) red rays. 3, Geranium leaves; (E) full radiation; (F) blue rays; 



(G) green rays; (H) red rays. 



THE HELIOTYPE PRINTING CO. BOSTON 



