. Carnegie Institution of Washington publication. EFFECT OF STOMATAL MOVEMENT UPON TRANSPIRATION. 81 The difference in the stomatal movement of the cut stems and the watered field plants was striking. The watered plants showed 15 and 20 per cent opening from 10 p. m. until 1 a. m., and closure from then to dawn. This was largely the result of the slight rain which 90 fin / \ \ 7O X / \ jj . — N ^ --^. s / -- CO ~^ X •"^ x B y v X V SA / /'*• in "* . --' ..•"* A \ / •4-0 / \ "V. V / / TO / — "-•s C V 7O J ~~ _- \ )O \ 0 / f 'l 1O II MT. I 2 3 4- 5 6 7 8 9 10 II
. Carnegie Institution of Washington publication. EFFECT OF STOMATAL MOVEMENT UPON TRANSPIRATION. 81 The difference in the stomatal movement of the cut stems and the watered field plants was striking. The watered plants showed 15 and 20 per cent opening from 10 p. m. until 1 a. m., and closure from then to dawn. This was largely the result of the slight rain which 90 fin / \ \ 7O X / \ jj . — N ^ --^. s / -- CO ~^ X •"^ x B y v X V SA / /'*• in "* . --' ..•"* A \ / •4-0 / \ "V. V / / TO / — "-•s C V 7O J ~~ _- \ )O \ 0 / f 'l 1O II MT. I 2 3 4- 5 6 7 8 9 10 II NOON I 23456789 IO FIG. 37.—Series 17, weather data for August 8-9, 1916; sunlight (A), temperature (B), humidity (C). too 90 60 70 60 60 30 20 10 V ' \ ^ A \ la II MT. I 2 3 4 5 6 7 8 9 10 II WON 12345678910 FIG. 38.—Series 17, showing average movement of alfalfa stomata in watered (A) and unwatered (B) field plants, and in cut stems (C). too 90 80 70. 10 II MT. I Z 3456789 IO II NOON I 234- 56789 (O PIG. 39.—Series 17, showing stomatal movement (A), and transpiration (B) in cut stems of alfalfa; humidity (C). occurred after 10 p. m. The cut stems had closed stomata at 10 p. m., but they opened slowly to 10 per cent at 1 a. m. and then began closing. At 3 a. m. this was complete. The next hour, however,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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