70 Keeble. — The Hanging Foliage of 
Leaf and leaflets al- 
Leaflets again spread 
Leaflets again allowed 
lowed to hang downward, 
overlapping. 
out in various planes. 
to hang vertically down- 
ward. 
14 
10 
13 
14 
15 
15 
• 1 1 
H 
13 
14 
15 
12 
13 
!3 
14 
15 
1 2 
13 
14 
13 
16 
12 
13 
13 
L 3 
15 
i *3 
12 
14 
H 
15 
13 
13 
13 
14 
T 5 
13 
1.3 
12 
L 3 
15 
13 
12 
13 
H 
15 
H 
13 
12 
12 
- — - 
— 
— 
— 
— ! : 
150 
123 
129 
131 
136 
Average — 1 50. 
Average 
= 126. 
Average ■ 
= 133 - 5 - 
Transpiration, then, is increased when the leaflets are 
spread out in various planes ; so that, bearing in mind the 
reasons given previously for the small differences in these 
numbers, it may be said that the young hanging leaves 
of such trees as Amherstia nobilis do gain, by virtue of 
their position, some protection from the tax of excessive 
transpiration. 
Before, however, drawing definite inferences from any of 
these experiments, it was determined to test Stahl’s con- 
clusions in yet another way. Pairs of leaflets, one young red 
and one older green', were cut off from leaves whose rates 
of transpiration had been determined. These pairs were 
weighed and then exposed to the sun. It was found re- 
peatedly in such cases that the red leaflets lost weight quicker 
than the green, and withered sooner : that is to say, the 
supply of water being cut off from the leaves, green and red 
alike, the thin texture of the latter offers far less resistance 
to loss of water than does the stouter tissue of the green. 
If an inference may be drawn from this experiment, in which 
the leaves are subjected to such unnatural conditions, it is 
that, as already shown in other ways, the delicate tissue of 
the young red leaves does stand in need of protection. The 
conclusions which must therefore be drawn from the various 
experiments detailed above are : 
(i) The fact that the young red leaves of hanging branches 
