. Carnegie Institution of Washington publication. .109 .04-1 83 .065 Experiment XL —This experiment was carried out with three Boer- havias just coming into flower. The record was begun at 6h30ra , August 16, and discontinued at 9h30ra , August 17. The total leaf area of the three plants was sq. cm. The average rate of water loss from all three plants for the whole period was gram, or gram per square centimeter of leaf surface. The usual curves are given in figure 16. The period of the experiment was not long enough to warrant any discussion further than to
. Carnegie Institution of Washington publication. .109 .04-1 83 .065 Experiment XL —This experiment was carried out with three Boer- havias just coming into flower. The record was begun at 6h30ra , August 16, and discontinued at 9h30ra , August 17. The total leaf area of the three plants was sq. cm. The average rate of water loss from all three plants for the whole period was gram, or gram per square centimeter of leaf surface. The usual curves are given in figure 16. The period of the experiment was not long enough to warrant any discussion further than to state that a single maximum is shown at about 10 , with a temperature of ° F. and an evaporation rate of gram. Minima are not definitely shown within the period. Experiment XII. —The subject was a single flow- ering plant of Boerhavia in a Stender dish standing in the shade. The record extended from 6h30m , August 16, to 9h30'u , August 17. The leaf area was not obtained. The hourly rate of water loss from the entire plant for the whole period was gram. "The ratio curve for this plant need not be pre- sented. It shows a max- imum having a rate of relative transpiration of at , with a temperature of ° F., and an evaporation rate of gram. Minima are not certainly indicated by the curve. Experiment XIII.—The subjects were three flowering Boerhavia plants standing in the shade. The record extended from 10 , August 18, to S'^O"1 , August 21, when wilting occurred. The total area was sq. cm. From 6 August 19 to the end of the experiment the entire culture transpired at the average rate of gram per hour, or gram per hour per unit leaf surface. Only a few weighings were made and a curve could not be constructed. Experiment XIV. —- The subject was a single plant of Boerhavia standing in bright sunshine. The record extended from 6 to \. /75 /.02Z '.OH .041 76 [\ .020 6: 30 16
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