Smithsonian institution: annual report
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ABSTRACT THE report of the secretary of the Smithsonian Institution for the year ended June 30, 1939, which has been published, refers to the completion by the Astrophysical Observatory of
the enormous task of recomputing the daily solar constant values from all its observing stations since 1923, apart from the final corrections and general discussion, which were expected to
be concluded by October 1939. The Division of Radiation and Organisms gave much attention during the year to photosynthesis, factors influencing plant growth and the stimulative action of
ultra-violet radiation. Experimental evidence was obtained indicating the formation during photosynthesis of a material which combines with or absorbs carbon dioxide and resembles
chlorophyll in character. A quantitative method for the isolation of hormones from plants is being developed, and the effect of radiation on the growth of excised roots and leaves has been
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customer support RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Smithsonian Institution: Annual Report. _Nature_ 145, 930 (1940).
https://doi.org/10.1038/145930c0 Download citation * Issue Date: 15 June 1940 * DOI: https://doi.org/10.1038/145930c0 SHARE THIS ARTICLE Anyone you share the following link with will be able
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