K. M1YAKE.— INFLUENCE OF THE SALTS ETC. 



201 



the same. The ratio of these anions required to produce the 

 most favorable medium for the development of the plants was 

 25 : 5, although the development of the seedling did not reach 

 that of the control plants. And the antagonistic power of the 

 SO/' ion required to neutralize the toxic effect of CI' ion was 

 slightly greater than that of CI' to SO" ion. 



VI. Experiment with MgCL and MgSO,. 



The antagonism between CI' and SO" ions was again 

 examined with magnesium chloride and sulphate in the same 

 manner as in the preceding experiment. The following result 

 which is almost similar to that of the experiment with sodium 

 chloride and sulphate was obtained. 



Solutions used 



Length 

 of leaf 



Length 

 of root 



Number 

 of roots 



1/10 N. MgGU 30 cc. 



mm. 



45 



mm. 



35 



1 



1/10 N. MgCl 2 2,5 cc. + 1/10 1$. MgS0 4 5 cc. 



60 



40 



1 



1/10 N. MgOl 2 20 cc. + 1/10 N. MgSO i 10 cc. 



55 



30 



1 



1/10 N. MgCL 15 cc. +1/10 N. MgS0 4 15 cc. 



48 



30 



1 



1/10 N. MgCl 2 10 cc. +1/10 ~8. MgSO, 20 cc. 



50 



25 



1 



1/10 N. MgCk 5 cc. + 1/10 N. MgS0 4 25 cc. 



55 



25 



1 



1/10 N. 3fgS0 4 30 cc. 



40 



25 



1 



' Distilled water 30 cc. 



80 



50 



7 



VII. Experiment with NaCl and MgS0 4 . 



The antagonistic action of Na', Mg", CI' and SO" ions 

 on each other was established with sodium chloride and 

 magnesium sulphate in the same manner as in the case of 

 experiment I. 



The following result was obtained. 



