. Carnegie Institution of Washington publication. Imbibition and Growth in Fruits. 165 fying 45 on August 3. Great daily variations in size, with a net total increase, were displayed every day. Usually enlargement could be detected between noon and 2 o'clock, which continued until 8 or 10 the following morning. If the sun rese clear, shrinkage began imme- diately. If the morning was foggy it would be delayed. Minor vari- ations might be brought about by the shade of clouds, especially notice- able at noonday August 6 and to be seen at other times. m. m. 12 m. m.
. Carnegie Institution of Washington publication. Imbibition and Growth in Fruits. 165 fying 45 on August 3. Great daily variations in size, with a net total increase, were displayed every day. Usually enlargement could be detected between noon and 2 o'clock, which continued until 8 or 10 the following morning. If the sun rese clear, shrinkage began imme- diately. If the morning was foggy it would be delayed. Minor vari- ations might be brought about by the shade of clouds, especially notice- able at noonday August 6 and to be seen at other times. m. m. 12 m. m. Juglar^s Calif, /quercina 14 C. 2I°C. I 8 a. C. during this period I . rtim. Sept. 9,1918 , Heavy and.'continuous TO. 15 25 m. 5 15 25 / / SEPT. 9, 1918 Onto day in dark room at I7°C. X 20 Swelling for 20 hours Branch 30 cm long in vessel — — ~— / then slight shrinkage of, water 1 — • P FIG. 48.—Variations in volume of nut of Jtiglans during 56 days. Enlargement is denoted by downward course of pen tracing, X 10. The lowermost section of the figure gives auxographic record of swelling of a nut in a dark room on a branch 30 cm. in length with the cut end in a vessel of water. Swelling for 20 hours occurred after shrinkage began as denoted by upward course of pen tracing. After these facts were noted, experimental modifications were arranged. Temperatures were taken from a branch 16 mm. in thick- ness which were probably within a degree of that of the nut at all times. A screen was arranged to cut off the direct rays of the sun at midday, the nut being exposed for about 4 hours in the forenoon to di- rect illumination. The temperatures ranged from 14° to 25° C. The occurrence of fogs and of rain added to the variations in the conditions affecting transpiration. The shrinkage in the forenoon was abrupt and marked, being lessened on foggy days, and reaching an extreme of 4 mm. when the temperature rose from 14° to 25° C. in the 4 hours, while it was
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