250 
K. M1YAKE. 
Salts 
Concentration 
used 
I M. 
1*0 M. 
£0 M. 
TöüM 
1 2ÖÖ M 
\tt>öö m 
I2" 00O M 
f 1 « 
,TöoööM 
Control 
Length of leaf l^min. 
20 
40 
60 
80 
83 
112 
97 
90 
80 
MgS0 4 
Length of root.i^mm. 
35 
65 
80 
85 
140 
118 
IOO 
125 
Number of roots. 
1 
1 
1 
3 
3 
9 
6 
5 
6 
Length of leaf. 
1 
27 
56 
80 
83 
93 
IOO 
88 
80 
MgCl a 
Length of root. 
("died 
42 
45 
70 
90 
165 
no 
112 
125 
Number of roots. 
) 
1 
I 
2 
2 
6 
8 
6 
6 
Length of leaf. 
30 
47 
73 
80 
90 
90 
105 
80 
CaCla 
Length of root. 
(died 
2 5 
40 
97 
IOO 
150 
IOO 
150 
'25 
Number of roots. 
1 
3 
6 
6 
6 
8 
9 
7 
6 
Length of leaf. 
33 
42 
120 
107 
IOO 
97 
93 
80 
Na 2 S0 4 
Length of root. 
r died 
1 
30 
5o 
90 
85 
90 
IOO 
IOO 
12 5 
Number of roots. 
) 
1 
1 
7 
7 
9* 
7 
9 
6 
Length of leaf. 
1 
42 
67 
97 
95 
85 
82 
82 
80 
NaCl 
Length of root. 
►died 
30 
63 
150 
130 
70 
no 
130 
I2 5 
Number of roots. 
1 
I 
3 
6 
5 
5 
4 
r\ 
7 
6 
Length of leaf. 
33 
83 
117 
117 
97 
85 
80 
Na 2 C0 3 
Length of root. 
died 
[■died 
20 
30 
145 
!45 
105 
85 
125 
Number of roots. 
) 
1 
5 
5 
6 
7 
7 
6 
Length of leaf. 
30 
40 
105 
115 
no 
103 
103 
80 
NaHCQ 3 
Length of root. 
died 
18 
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 1/100 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. 
