170 The Philippine Journal of Science _ 1988 
the two free, parallel edges. To study the daily fluctuations in 
“opening” and “closing” of the pinna, the distance between the 
two free edges of the pinna (called the “apparent: width”) was 
measured immediately after making each cobalt-chloride-paper 
test. The data thus obtained are given in column 4 of Table 1. 
A Livingston white spherical atmometer, placed in full sun- 
light near the plants, was read at the times of measurement, 
in order to determine the evaporating power of the air, and the 
evaporation data are given in column 6 of Table 1. 
A.M. PM. A.M. 
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Fic. a Graphs showing transpiring power (dot and dash line) of Cocos nucifera; apparent 
pinna width (full line), and evaporating power of the air (dash line)—all plotted in per- 
centage of range from lowest to highest values. (Data are from Table 1.) 
To facilitate comparison between the changes in transpiring 
power, apparent pinna width, and evaporating power of the air, 
the actual values presented in the table have also been expressed — 
as relative values, in terms of percentage of the total range in 
each case; and these relative values are shown for the three 
kinds of data in columns 3, 5, and 7, respectively. Transpiring 
power, for example, ranges in value from 0.26 to 0.56, the total 
range being 0.30. This range was divided into one hundred 
equal parts, and each actual value is expressed in the table as 
