io86 
Irving—The Effect of Chloroform 
the first two hours the output of C 0 2 rose to o-ooio grm. and during 
eighteen hours did not fall below the initial. The output of a normal 
leaf during that time would have fallen considerably, as the curves in Fig. 7 
show. Type A in that schema is the mean between the results of Exp. VII 
and Exp. VIII, and illustrates the continued augmentation of respiration 
that results from a small continuous dosing with chloroform. 
The leaf was slightly brown, in parts, at the end of the experiment, but 
mostly green. 
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Time, in Hours 
Fig. io. 
Fig. ii. 
Experiment VIII. Concentration of Chloroform — 0*05 c.c. per litre of 
air-current. This is another experiment with a single Cherry Laurel leaf 
quite similar to Exp. VII. 
Fig. 10 shows that this leaf, which weighed i*8 grms., responds in the 
same way to continuous treatment with this concentration of chloroform, 
giving a curve of type A. 
Experiment IX. Concentration of Chloroform = 008 c.c. per litre of 
air-current. This experiment is carried out with Barley shoots, fifteen 
grammes in the glass jar used in Exps. I-VI, and after two normal respi¬ 
ration readings the air-current was charged continuously with 008 c.c. 
chloroform. 
The effect of this was to raise the output of C 0 2 in the characteristic 
outburst, after which the C 0 2 declined in a way very much like type B. 
The C 0 2 rose somewhat in the last two readings, so that we may style it 
intermediate between B and C. 
