The Reactions of Planarians to Light (Classic Reprint)

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Excerpt from The Reactions of Planarians to Light Light is one of the physical factors which in¿uence the behavior of organisms. The great majority of living things are normally subjected to regular periodic changes in the amount Of light to which they are exposed during the alternation of day and night. In addition to these constant periodic changes, there are innu merable irregular gradations in both the intensity and the character of the light naturally acting upon any organism. An agent of such wide range and almost universal in¿uence as light ought, therefore, when properly analyzed, to prove of material service in interpreting the behavior of animals and plants. The depend ence upon light of animals provided with organs of sight, is self evident. The direct bearing, too, of light upon chlorophyllaceous plants in the manufacture of their food substance, is plain. But how far light plays a direct part in the life of non-photosynthetic plants and of animals which cannot see, is less clear. Although possessing eyes, it is very probable that planarians are unable to see in the sense of distinguishing shapes, and it is questionable how far they can distinguish between even large regions of different light intensity. The Object of the following paper is to examine the relation of light to animal behavior as applied to certain planarians. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.