. Carnegie Institution of Washington publication. FIG. 26. A, tracing of an auxo- graphic record of the variations in length of a stem of Opuntia ver- sicolor. Below is a line showing the daily vari- ations in temperature. Thegraph is composed of sections of straight lines representing con- ditions of illumina- tion. Interruptions of the sunlight by cloudiness are shown on April 21,22, 23, and 29. B, auxographic record of variations in thickness of stem of Opuntia versicolor, with temperature and illumination indicat- ed. (After Mrs. E. B. Shreve.) was under condit
. Carnegie Institution of Washington publication. FIG. 26. A, tracing of an auxo- graphic record of the variations in length of a stem of Opuntia ver- sicolor. Below is a line showing the daily vari- ations in temperature. Thegraph is composed of sections of straight lines representing con- ditions of illumina- tion. Interruptions of the sunlight by cloudiness are shown on April 21,22, 23, and 29. B, auxographic record of variations in thickness of stem of Opuntia versicolor, with temperature and illumination indicat- ed. (After Mrs. E. B. Shreve.) was under conditions of satisfied imbibition capacity, the plotted line showing such capacity would also be that of growth. Such a condition does not exist, however. Also, if the simple capacity for imbibition determined volume, and this capacity were always satisfied, the plotted line of water capacity might be identical with that of the daily varia- tion in volume of the mature organ. Neither does this condition exist (fig. 27). The record of variations in volume of a joint from the time of its beginning to maturity and through the following season, and selected portions of this graph, are reproduced in figures 28 and 29. The aspect of the daily variations in volume shows seasonal altera- tions and depends to some extent upon the age of the mature joint, but it is evident that the joint begins to increase in volume in the 1 See Shreve, E. B. An analysis of the causes of variations in the transpiring power of cacti. Physiol. Researches, 2: No. 13. August 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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