Smithsonian miscellaneous collections . (Publication 3410) GUY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION MAY 4, 1937 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 95. NUMBER 24(End of Volume) TIME COURSE OF PHOTOSYNTHESISFOR A HIGHER PLANT (With Two Plates) BY E. D. McALISTER Division of Radiation and Organisms, Smithsonian Institution. (Publication 3410) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION MAY 4, 193 7 BALTIMORE, U. 8. A. TIME COURSE OF PHOTOSYNTHESIS FOR AHIGHER PLANT By E. D. McALISTER Division of Radiation and Organisms, Smithsonian Institution(With
Smithsonian miscellaneous collections . (Publication 3410) GUY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION MAY 4, 1937 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 95. NUMBER 24(End of Volume) TIME COURSE OF PHOTOSYNTHESISFOR A HIGHER PLANT (With Two Plates) BY E. D. McALISTER Division of Radiation and Organisms, Smithsonian Institution. (Publication 3410) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION MAY 4, 193 7 BALTIMORE, U. 8. A. TIME COURSE OF PHOTOSYNTHESIS FOR AHIGHER PLANT By E. D. McALISTER Division of Radiation and Organisms, Smithsonian Institution(With Two Plates) A spectrographic (infrared) method of carbon dioxide determina-tion of unique speed and sensitivity has been developed. It has theadditional merits of being independent of water vapor and of havingsmall pressure and temperature corrections. At low concentrationsthe method will detect one part of carbon dioxide gas to a millionparts of air. Without a great loss in sensitivity these measurementsmay be made in a fraction of a second. By changing the wave lengthof radiation used, other gases may be similarly observed. For ex-ample, by using radiation of wave lengths absorbed by water vaporthe transpiration of a plant may be studied with equal success. Becauseof its speed, the method is particularly useful in following the timecours
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