198 



THE nor. i mt : 1 L MA < U ZINE. 



Vol. XX VII. No. ssi 



In this case, we also observed that the mutual counter- 

 action between sodium and magnesium ions was clearly 

 revealed, though the}- did not perfectly neutralize each other. 

 The neutralizing power of magnesium ion toward the toxic 

 effect of sodium ion was greater than that of sodium to 



magnesium as in the case of — X. Aa 2 S0 4 25cc.+ — -~- N. 



MgSOi 5 cc. when the highest development of the seedlings was 

 really observed. The result of this experimeut almost coincides 

 with that of the preceding experiment. 



III. Experiment with NaCl and CaCL. 



The antagonistic phenomenon between sodium and calcium 



ions was examined with ^ normal solution of sodium and 



calcium chloride in manner idential with that followed in the 

 case of the experiment with sodium and magnesium chloride. 

 12 days after the seedlings were transplanted to the respective 

 culture solutions, they showed very remarkable differences of 

 development. The plants were measured on the same day with 

 the following result. 



Solutions used 



Length 

 of leaf 



Length 

 of root 



Number 

 of roots 



1/10 N. NaCl 30 cc. 



mm. 



38 



mm. 



25 



1 



1/10 N. NaCl 25cc.+ l/10 N. CaC% 5 cc. 



69 



60 



9 



1/10 N. NaCl 20cc. + l/10 N. CaCh 10 cc. 



55 



50 



7 



1/10 X. NaCl l.j cc. + 1/10 N. CaCh 15 cc. 



47 



35 



5 



1/10 N. NaCl lOcc + 1/10 X. CaCl 2 20 cc. 



47 



40 



5 



1/10 N. NaCl 5cc. + l/10 X. CaCl^25cc. 



47 



35 



3 



L/10 N. CaCl 2 30 cc. 



40 



35 



1 



Distilled water .'50 cc. 



50 



80 



6 



From the result, it is evident that in a mixture of sodium 

 and calcium ions in proper proportion, each of which indivi- 



