Proceedings of the Second Pan American Scientific Congress, Washington, U. S. A., Monday, December 27, 1915 to Saturday, January 8, 1916 2
Proceedings of the Second Pan American Scientific Congress, Washington, U. S. A., Monday, December 27, 1915 to Saturday, January 8, 1916 2
Pan American Scientific Congress (2d : 1915-1916 : Washington, D. C.)
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We know, for example, that, in general, plant cells generate starch only in the presence of sunlight, and that starch is necessary to plant growth. How much solar energy can a given plant profitably utilize? What plants can be raised most profitably when the average daily radiation is, let us say, 800 calories, and \irhat plants where it is only one-half that amount? What effect has the daily average of solar radiation upon the percentage of sugar in beets? These are only a few of the questions... that should be solved, now^ tliat we have means of obtaining continuous records of the intensity of solar and sky radiation. NOTES. (1) Transactions of the International Union for Ckxyperation In Solar Be- search, Manchester, 1906, 1 : 28L (2) Abbot, O. G. The Silver Disk PyrheUometer. Smithsonian Misc. OolL, V. 56, No. 19. (8) Desains, P. Compes Rendus, 1874, T. 78, p. 1455. (4) Abbot, O. G., and Fowle, F. B. Annals of the Astrophysical Observatory of the Smithsonian Institution, 2:89-47. (5) Callendar, H.
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