1098 
Irving .— The Effect of Chloroform 
The effect upon the C 0 2 -production and upon the condition of the 
leaves was practically the same as in the previous experiment (Fig. 24). 
Stronger doses of chloroform would no doubt have reduced the C 0 2 - 
output to zero still more quickly, but sufficient has been shown in this 
direction in the experiments in Part I. 
0028 
0026 
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< -0022 
a 0020 
O ooie 
Z 0016 
‘0014 
0012 
u 0010 
0 0008 
fcj -0006 
a 000* 
3 0002 
O 0000 
moursO 2 * 6 8 10 12 14 16 O 2 4 6 8 IO 12 14 
Fig. 24. 
Conclusions. 
Effect of chloroform upon respiration of leaves. 
1. The effect depends upon the dose of chloroform, and some five 
types of curve may be distinguished, forming a regular progression between 
the augmentative effect of minute doses and the inhibitory effect of large 
doses. These types of curve are grouped together in a schema (Fig. 7, 
p. 1083). 
2. Very small doses of chloroform increase the respiration ; this effect 
may be maintained if the chloroform is given continuously, but the respira¬ 
tion reverts to normal when the chloroform is withdrawn. 
3. Medium doses of chloroform cause an initial outburst of C 0 2 , which 
is followed by a decline in the C 0 2 -production to much below normal; the 
rate and extent of this decline increase with the dose. 
4. Strong doses of chloroform abolish the initial outburst and the CO.,- 
production at once rapidly falls to zero. 
5. The early period of the application of chloroform is the effective 
time ; and the same subsequent curve of C 0 2 -production may result whether 
the chloroform is then withdrawn or kept on continuously. 
On comparing the single doses of chloroform given in Section I with 
