18 The Philippine Journal of Science 1917 
are plotted independently of temperature, but the temperature 
at which the experiment or experiments were performed is placed 
beside each point. The curve passes very near the point 
that represents the three similar values obtained with a light 
intensity of four units and about midway between the other 
two values. At light intensity of six units it is drawn between 
the two figures for assimilation. The results give a smooth 
curve, which shows that with each increase in light intensity 
there is a rise in assimilation, but a rise that is less and less 
per unit of light for each increase. This would indicate at once 
Light intensities. 
0 20 30 +0 
a p30.5* 
ae 
Ss 
% 
Carbon dioxide assimilation in milligrams. 
Fic. 3. Relation of light intensity and carbon dioxide assimilation in cherry laurel. 
that we might be dealing with a curve of light and not of temper- 
ature. The highest rise for a given change in light intensity 
is obtained when the light is increased from one to two units. 
This rise is certainly independent of temperature. 
It may be noted that a curve for different light intensities 
between 1 and 26, at a temperature of 24°, would be exactly 
the same as that in fig. 3 for the same intensities of light. 
The figures for light intensity of one, two, and twenty-six units 
would be the same, while the actual figure in Table 2 for light 
intensity four and 24.8° C. would be exactly on the curve. An 
— of fig. 3 shows that the other numbers would fall 
in line. 
The whole curve in fig. 3 is apparently the same as a curve 
for different light intensities at 30.5°. In Table 5 it was shown 
that with unit intensity of light, increasing the temperature 
