Excerpt from The Proceedings of the Linnean Society of New South Wales for the Year 1941, Vol. 66: With Fourteen Plates; 206 Text-Figures Helianthus experiments it was shown that plants given abundant nitrogen quickly exhausted their water supply and so suffered severely after a drought of only a fort night, whereas smaller nitrogen-starved plants were more economical with their water supply and thrived after a drought lasting nearly four months. Further, in these two groups of plants there was no significant difference in the rate of loss of water per unit area. Thus the effect of the difference in concentration of nitrogen on the resistance of a plant to drought, might be only indirect, through plant size affecting the rapidity with which a given supply of water is exhausted. In a second Helianthus experiment, drought was measured in terms of the volume of water used rather than as the time during which no water was provided. The results will determine whether different concentrations of nitrogen and potassium affect the drought resistance of Helianthus other than by plant size and. Rate of use of water, both of which factors may be compensated for by root development in the field. Serial readings have been taken of leaf-area and water-use in addition to plant-height. A paper, A Survey of the Mistletoe of New South Wales, will be published in the next Part of the proceedings, while a second, to be published jointly with Professor E. Ashby, has been prepared for publica tion in the proceedings. This paper gives some results of experiments on drought resistance. 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.