7 o? 
the Respiratory Exchanges of Leaves. 
(the volume of the chamber being 1 50 c.c.). As shown in Fig. 9, a stimula- 
tion of the C 0 2 output is also indicated, although the quantity concerned 
was small. 
The very rapid absorption of oxygen only lasted a short time, then 
dropped to nearly the normal level and fell further slowly along with the 
(i 
to 
'OQ 
08 
u. 
< 
UJ 07 
_l 
OS , 
iy 0 6 
CL 
3 OS 
O 
X 
OS 0'4 
UJ 
Q. 
0 03 
02 
01 
- 
; 
— 
n_ 
.... 
L — 
\ 
2 4 6 8 10 12 & ‘<0 18 2Q 
HOURS AFTER CHLOROFORM 
Fig. 9. 
C 0 2 output. After twenty hours both had fallen considerably, but the 
C 0 2 output more than the 0 2 intake, the respiratory quotient being 0*4. 
Experiment IX. September 32, 1909. Dose, o-i c.c. for fifteen 
minutes. Temperature, i4*3-J5*8° C. Six leaves in the dark for four days 
previously. 
f 
L. 
rr: 
A 
2 4 6 8 10 (2 (4 /6 18 
HOURS AFTER FIRST DOSE 
Fig. io. 
20 
