Oct. 1013.] 



K. MTYAKE.— INFLUENCE OF THE SALTS ETC. 



203 



IX. Experiment with Na 2 S0 4 and CaCl 2 . 



The antagonistic action of Na' , Ca" , CI' and SO" on each 

 other was examined with sodium sulphate and calcium chloride 

 in the same manner as in the experiment II. The result 

 obtained was as follows : 



Solutions used 



Length 

 of leaf 



Length 

 of root 



Number 

 of roots 



1/10 N. Na 2 S0 4 30 cc. 



mm. 



45 



mm. 



35 



1 



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



80 



90 



9 



1/10 N. Na 2 S0 4 20 cc+1/10 K CaCl, 10 cc. 



80 



90 



7 



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



70 



50 



7 



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



57 



30 



5 



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



50 



38 



4 



1/10 N. CaCl 2 30 cc. 



45 



25 



1 



Distilled water 30 cc. 



80 



50 



7 



As will be seen in the above result, in a suitable mixture 

 of Na', Ca", CI' and SO" ions, their toxic effects completely 

 disappear. It was also observed that the combined antagon- 

 istic actions of cations and anions have a more favorable effect 

 than that of one of them. 



X. Experiment with MgS0 4 and CaCl> 



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

 each other was established with magnesium sulphate and 

 calcium chloride in the same manner as in the experiment IY. 

 an d the following result which is similar to that of the preced- 

 i ng experiment was obtained. 



