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Excerpt from Phytohormones (Organic Acids) In Relation to the Rooting of the Certain Horticultural Plants In attempting to analyze the many chemical reactions and physical conditions that contribute to growth in plants, Boysen Jensen usefully divides the substances concerned into two groups: (a) nutritional substances, and (b) regulating substances. In a broad sense, water, minerals, gases, and organic foodstuffs, which supply the material and energy for building the plant structure come under the first heading. The second group is much less clearly understood; indeed, it is only within recent years that any light has been thrown on this aspect of plant growth. 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.