150 BOTANICAL GAZETTE [ AUGUST 
growth occurred. The two next weaker solutions allowed the 
seedlings to grow. The killing point may be placed, then, at 
too gram-molecule. Those roots which were killed remained 
rigid, but were somewhat discolored. In the weaker solutions 
which did not entirely inhibit the growth a retardation of the 
growth is apparent. 
The results of the experiments with P’ sativum are given in 
the following table: 
PISUM SATIVUM. 
= 1 
CYANIDES. 25 BD 100 700 Eis 
mol, mol, mol. | eae 
Ist 24h co do | 22s | 1Se 
F Oe e305 i , ae 
K, ENN} action “ee eee rete a Me 
| “ce 
K Ist 24 hours Bo 5 “ce 
3Fe (CN), ia 24 hours | ‘ewe 4 - | 
The results of the experiments with Zea Mais are given ’ 
the following table: 
ZEA MAIS. a 
1 
CYANIDEs. as #y 100 aap 
mol, mol, mol, 
aFe ( een ae ee ae be 
K.Fe (CN Ist 24 hours ak 1.5 “ 8.25 “ pe 
aFe (CN), 2d 24 hours 2. ae ee | 
In both of the salts no growth occurred in the 25 naam 
solution. In the sv Mol. and ;1, mol. solutions cor 
noted for the first twenty-four hours but none afterwards. a 
zoo mol. solution showed growth for the entire period, rp i : 
here as in the case of the P. sativum seedlings the killing P° a 
is the zoy gram-molecule solution, 1m 
In the case of both salts the dissociation will be in the e 
of K* ions and Fe (CN)- ions, the only difference being 
fact that whereas K,Fe (CN), solutions contain four K pa 
K;Fe(CN), solutions contain three K ions. For the ss 
jutios 
used the dissociation is not complete. 3 
