INFLUENCE OF THE ALKALI SALTS UPON TIIE GROWTH OF RICE PLANTS. 285 
N. NaCl 25 cc. + -Jj N. CaCl 2 5 cc. 
70 
40 
9 
^ N. NaCl 20 cc. 4- J, N. CaCl 2 10 cc. 
70 
40 
9 
J, N. NaCl 1 5 cc. + Jjj N. CaCl 2 1 5 cc. 
60 
25 
8 
J* N. NaCl 10 cc. + J ö N. CaCl 2 20 cc. 
56 
20 
8 
Jg N. NaCl 5 cc. + J 0 N. CaCl 2 25 cc. 
50 
20 
6 
Jg N. CaCl 2 30 cc. 
44 
22 
6 
Jg N. NaCl 25 re. + Jg N. BaCl a 5 cc. 
40 
20 
3 
J g N. NaCl 20 cc. + Jg N. BaCl 2 10 cc. 
4i 
18 
5 
^g N. NaCl 15 cc. + Jg N. BaCl 2 15 cc. 
30 
15 
3 
Jg N. NaCl 10 cc. + Jg N. BaCl 2 20 cc. 
30 
20 
3 
^g N. NaCl 5 cc. + Jg N. BaCl 2 25 cc. 
28 
*7 
3 
Jg N. BaCl 2 30 cc. 
29 
10 
3 
Jg N. NaCl 25 cc. + J g N. SrCl 2 5 cc. 
50 
22 
6 
^g N. NaCl 20 cc. + Jg N. SrCl a 10 cc. 
4 7 
20 
4 
Jg N. NaCl 15 cc. + Jg N. SrCl 2 15 cc. 
45 
16 
5 
J g N. NaCl 10 cc. + Jg N. SrCl 2 20 cc. 
40 
10 
4 
Jg N. NaCl 5 cc. + Jg N. SrCl a 25 cc. 
36 
16 
4 
Jg N. SrCl 2 30 cc. 
28 
15 
3 
C. Summary. 
The injurious effect of the metallic ions upon the growth of rice 
seedlings is perfectly counteracted only by the presence of calcium ion 
while strontium ion can exert but a slight influence in neutralizing the 
toxicity of the other cations. Barium ion not only has no beneficial 
action, but rather a depressing effect is observed. It is tbus seen that 
barium or strontium in the concentration used can not replace calcium in 
its antagonistic action. 
