Development of Chlorophyll , g! x 
TABLE I. 
Etiolated Leaves of Barley. 
No. of 
Reading ,. 
Grams of C 0 2 
given out. 
Illumination. 
Colour of Leaves. 
I 
*0035 
Dark 
Orange yellow 
2 
•0032 
3 
•0036 
Light 
4 
•°°35 
>> 
Traces of green 
5 
•0030 
6 
•0028 
Dark 
km 
7 
•0029 
>> 
8 
•0024 
>* 
9 
IO 
•0028 
.0026 
Light 
ii 
•0024 
)f 
Pale green 
I 2 
•0020 
}) 
T 3 
•0022 
Dark 
*4 
•0020 
it 
15 
•002 I 
16 
•OOI9 
17 
• OOi8 
18 
•00l8 
Light 
l 9 
•0020 
>> 
Grass green 
20 
•002 1 
Dark 
21 
•0020 
)> 
attained by the leaves, due to the cumulative effect of the separate periods 
of illumination. 
Fig. 
