Oct." 1913 ] 



K. MTYAKE— INFLUENCE OF THE SALTS FTC. 



19' 



From the result, it is clear that the poisonous effect of 

 sodium and magnesium chloride largely disappears when we 

 mix the two salts specially in favorable proportions and this 

 phenomenon being due to the antagonism between sodium and 

 magnesium ions, since the anions were similar in both salts. 

 In these favorable mixtures, the length of leaf became greater 

 than that in distilled water, but the length of roots and the 

 number of roots was invariably less than in the case of the 

 control plants. It is evident therefore that the toxic effect of 

 sodium and of magnesium ions was mutually counteracted but 

 not completely neutralized. And it is further evident that the 

 toxic effect of sodium ion was antagonized much more by 

 magnesium ion than the latter by the former, this observation 

 coinciding with the result of Osterhout which was obtained 

 in the experiment wnth wheat seedlings. 



II. Experiment with Na 2 S04 and MgSO^. 



The antagonistic action of sodium and magnesium ions on 

 each other was once more tested with sodium and magnesium 

 sulphate in exactly the same method as in the preceding 

 experiment, except that the young seedlings transplanted were 

 about 20 mm. in height at beginning of the experiment. The 

 result obtained was as follows : 



Solutions used 



Leng-th 



Length 



Number 





of leaf 



of root 



of roots 





mm. 



m m . 





1/10 N. Na aJ S0 4 30 cc. 



45 



35 



1 



1/10 N. Na 2 S0 4 25 cc. + 1/10 N. 3fgS0 4 5 cc. 



60 



40 



5x 



1/10 N. Na 2 S0 4 20 cc. + 1/10 N. MgS0 4 10 cc. 



55 



30 



5x 



1/10 N. Na 2 S0 4 15 cc. + 1/10 N. MgS0 4 15 cc. 



55 



35 



4x 



1/10 N. Na 2 S0 4 10 cc. + 1/10 N. MgS0 4 20 cc. 



55 



40 



3x 



1/10 N. Na. 2 SCh 5 cc. + 1/10 N. MgSO, 25 cc. 



50 



33 



1 



]/10 TS.MgSOt 30 cc. 



10 



20 



1 



Distilled water 30 cc. 



80 



50 



7 



X Only one root was well developed. 



