TOXICITY OF GALACTOSE AND MANNOSE FOR GREEN PLANTS 433 
I. Galactose .025 inol 
.(.)2 5 nu) 
2. " " " 
+ maltose 
.025 " 
3- 
+ raffinose 
.025 " 
4. 
+ lactose 
.025 " 
5. 
+ arabinose 
.025 " 
6. 
7. 
+ levulose 
.025 " 
8. Pfeffer's solution. No sugar. 
Table 2 
Influence of Sugars on the Toxicity of Galactose 
Culture Solution 
Length of 
Primary 
Root 
(Cm.) 
Average 
Length of 
Lateral 
Root 
(Cm.) 
Length 
of Top 
(Cm.) 
Class 
of Injury 
Galactose .0125 mol. (2 cultures) . . . 
I 
0.5 
7 
5 
Galactose .0125 mol. +glucose .025 
mol. 
(I 
cul- 
ture) 
9 
8 
15 
0 
Galactose .0125 mol.+lactose .025 
mol. 
(I 
cul- 
ture) 
7 
1-5 
12 
3 
Galactose .0125 mol. +levulose .025 
mol. 
(I 
cul- 
ture) 
3 
6 
13 
. 3 
Galactose .0125 mol.+arabinose .02 = 
) mol 
(I 
cul- 
5 
I 
13 
4 
Galactose .0125 mol.+saccharose .02 
5 mol 
.(I 
cul- 
ture) 
2 
8 
15 
1 
Galactose .0125 mol.+lactose .025 
mol. 
(2 
cul- 
6 
0.5 
10 
4 
Galactose .0125 m.ol.+lactose .025 
mol. 
(2 
cul- 
I 
I 
12 
5 
Galactose .012 mol.+maltose .025 
mol. 
(2 
cul- 
tures) 
I 
0.5 
12 
5 
Galactose .0125 mol.+raffinose .025 
mol. 
(2 
cul- 
I 
0.5 
10 
5 
