704 Thoday . — On the Effect of Chloroform on 
There is evidence, however, that starved leaves are more susceptible to 
the influence of chloroform, and this factor may have contributed to the 
greater absorption of 0 2 observed in Experiment V. Experiments with 
larger doses of chloroform have not been made using Cherry Laurel leaves ; 
but in a few experiments with fresh leaves of Portugal Laurel, oxygen was 
absorbed more rapidly after bigger doses. 1 
When leaves of Cherry Laurel were treated with doses intermediate 
between o -2 and 0-50.0. of liquid chloroform per litre of air, they were in 
part rapidly disorganized, but in part green ; the results were therefore 
more complex, and need not be considered here as no new point arises from 
them. 2 
Fig. 6. 
The experiments which have so far been described fall obviously into 
two classes, the first dealing with the gaseous exchanges during so-called 
‘ stimulation ’, the second with the gaseous exchanges accompanying 
disorganization. 
In experiments of the former class absorption of oxygen and production 
of C 0 2 are similarly affected, suggesting that they are still closely corre- 
lated. 
In the latter class treatment with bigger doses of chloroform led to 
profound disorganization, accompanied by a rapid inrush of oxygen, and 
1 See also experiments with Helianthus. It is probable that such results represent the immediate 
fatal disorganization of a larger proportion of the cells of a leaf by bigger doses. 
2 Cf., however, p. 714. 
