250 
K. MIYAKE. 
Salts 
Concentration 
used 
i M. 
ÄM. 
2^5 M. 
I TOO M.j 2ÖÜ M JtOoO M-Wöü M.J tö ^ööM. 
Control 
Length of leaf.i^mm. 
20 
40 
60 
80 
83 
1 12 
97 
90 
80 
MgS0 4 
Length of root.i^mm. 
35 
65 
65 
80 
85 
140 
118 
100 
«5 
Number of roots. 
1 
1 
1 
3 
3 
9 
6 
5 
6 
Length of leaf. 
1 
27 
56 
80 
83 
93 
100 
88 
80 
MgCl 2 
Length of root. 
(died 
42 
45 
70 
90 
165 
no 
112 
I2 5 
Number of roots. 
J 
1 
1 
2 
2 
6 
8 
6 
6 
Length of leaf. 
I 
30 
47 
73 
80 
90 
90 
105 
80 
CaCl 2 
Length of root. 
(died 
2 5 
40 
97 
100 
150 
100 
!5o 
125 
Number of roots. 
1 
3 
6 
6 
6 
8 
9 
7 
6 
Length of leaf. 
I 
33 
42 
120 
107 
100 
97 
93 
80 
Na 2 S0 4 
Length of root. 
Mied 
30 
50 
90 
85 
90 
100 
100 
* 2 5 
Number of roots. 
) 
1 
1 
7 
7 
'9 
7 
9 
6 
Length of leaf. 
I 
42 
67 
97 
95 
85 
82 
82 
80 
NaCl 
Length of root. 
(died 
30 
63 
150 
130 
70 
no 
130 
iz 5 ; 
Number of roots. 
1 
3 
6 
5 
5 
4 
7 
7 
6 
Length of leaf. 
33 
83 
”7 
117 
97 
85 
8° | 
Na 2 C0 3 
Length of root. 
jdied 
j-died 
20 
30 
145 
145 
105 
85 
,2 5 
Number of roots. 
1 
5 
5 
6 
7 
7 
6 
Length of leaf. 
30 
40 
105 
115 
no 
103 
103 
80 
NaHC0 3 
Length of root. 
(died 
iS 
45 
90 
140 
60 
90 
105 
125 « 
Number of roots. 
) 
1 
1 
6 
5 
6 
6 
7 
6 
The results show that each salt acted as a toxic or stimulant upon 
the growth of rice seedlings, according to its concentration. Magnesium 
sulphate and chloride, calcium chloride and sodium carbonate were injurious 
when the concentrations were greater than 1/200 Mol, while sodium sulphate, 
chloride and bicarbonate were toxic when the concentrations were greater 
than i/roo Mol. In every salt, when the concentration was such that the 
toxic action ceased, the stimulating effect began and attained its highest 
degree in the following concentration; magnesium sulphate 1/1000 Mol., 
1) The length of root is that of longest rootlet while that of leaf is an average. 
