Antitoxic Action of Certain Bases 



155 



Fig. 6. — Antidotal relations between calcium and strontium; distilled water as the solvent 



13. N/100 Sr(N03)2 



14. N/500 Sr(N03)2 



15. N/1000 Sr(N03)2 



16. N/6000 Sr(N03)2 



17. N/20CaCl2+N/100 Sr(N03)2 



18. N/20CaCl2+N/500Sr(NO3)2 



19. N/20 CaCb +N/1000 Sr(N03)2 



20. N/100 CaCl2+N/250 Sr(N03)2 



21. N/100 CaCl2+N/500 Sr(N03)2 



22. N/20 CaCl2 



23. N/100 CaCl- 



24. Distilled water 



Potassium and strontium.- — Both potassium and strontium are strongly 

 toxic to the roots of wheat seedhngs. It is to be noted in Table 23 that 

 the root development is slight in solutions of either N/50 KCl or N/2000 

 SrCl2. It is shown further that the top growth of the wheat in these 

 solutions is greater than that in distilled water. The deleterious action 

 is counteracted when these salts are mixed in distilled water. In a 

 solution containing N/50 KCl + N/2000 SrCla the development of both 

 tops and roots of the seedlings is greater than those grown in individual 

 solutions of these salts. When N/1000 KCl and N/1000 SrCls are com- 

 bined, the poisonous action of the strontium is but slightly reduced. 



TABLE 23. Experiment with Wheat. 



Duration, Twenty-five Days. 

 Plants 



Data for Ten 



Composition of solution 



Total 



green weight 



of plants 



(grams) 



Average length 



of tops 

 (centimeters) 



Average length 



of roots 

 (centimeters) 



N/50KCl+N/100SrCl2.... 

 N/50 KCl+N/500 SrCh. . . . 

 N/50 KCl+N/2,000 StCU. . . 

 N/1,000 KCl+N/1,000 SrCl2 



N/2,000 SrCl2 



N/20 KCl 



N/50 KCl 



Distilled water 



0.762 



1.250 



1.500 



1.000 



0.750 







0.810 



0.680 



8.0 

 10.0 

 10.0 

 8.0 

 7.5 

 



8.0 

 7.0 



9.0 

 9.0 

 10.0 

 2.0 

 1.5 

 



1.5 

 6.0 



