Heliotropism

Heliotropism is the peculiar property shown by many plants, notably the sunflower, of alwaysturningtoward the 8un. In the case of seedlings the phenomenon is especially marked. The cells on the light side are apparently retarded in growth, thus causing a curvature toward that side. Professor Romanes has experimented with an intermittent tight, such as that of an electric spark discharge, upon mustard seedlings, and has found that the faehotropicefiect produced in this way is far greater than that caused by the sun or any other forra of light. Strange to say, however, this abnorinal influence is unaccompanied by the generation of phlorophyll, the green coloring matter in nlants which renmres smishiiie for