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Excerpt from Factors Affecting the Usefulness of Honeybees in Pollination A knowledge Of the structure of the blossoms is necessary to an understanding of the changes that may occur in the nectar, for if the nectar is exposed to dry air the water evaporates, leaving a higher percentage of sugars. If there is a wind, the rate of evaporation is increased. Furthermore, as the relative humidity of the atmosphere decreases, the sugar concentration of the nectar increases. On a clear day the relative humidity frequently drops from near 100 percent in early morning to less than-50 percent at noon. It was found, in an experiment under controlled conditions, that when the relative humidity was 100 percent the sugar concentration of poinsettia nectar was percent, but when the humidity had been 70 percent for several hours the concentration had increased to percent. 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.

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