Antitoxic Action of Certain Bases 



151 



TABLE 18. Experiment with Canada Field Pea. Duration, Twenty-fotjr Days. 



Data for Ten Plants 



Composition of solution 



Green 

 weight 

 of tops 

 (grams) 



Green 

 weight 

 of roots 

 (grams) 



Total 

 green 

 weight 



(grams) 



Average 

 length 

 of tops 

 (centi- 

 meters) 



Average 

 length 

 of roots 

 (centi- 

 meters) 



N/20 CaC]2+N/250 BaCI=. . . 

 N/20 CaCl2-FN/500 BaCh. . . 

 N/20 CaCl2-hN/l,000 BaCU. . 

 N/20 CaCl2+N/5,000 BaCU. . 

 N/100 CaCl2-l-N/10,000 BaCl 

 N/1,000 BaCl2 



N/5,000 BaCl2 



N/10,000 BaCl2 



N/20 CaCl2 



N/100 CaCl2 



Distilled water 



N/10CaCl2 



N/10 CaC!2-FN/l,000 BaCU. . 

 N/10 CaCl2+N/4,000 BaCh. . 

 Distilled water 



.50 

 .45 

 .65 

 .55 

 .25 



5, 

 5, 

 5, 

 4. 



5, 



Weight 

 not taken 

 0.82 



1.82 

 5.00 

 5.70 

 1.70 





 Weight 

 not taken 

 1.90 

 2.90 

 3.20 

 1.75 



9.40 

 9.60 

 9.30 



8.25 



8.77 



Small 



3.72 

 7.90 

 8.90 

 3.45 



10.0 

 9.5 



15.0 

 9.0 



10.5 



1.0 



3.0 

 6.5 

 9.0 

 10.0 

 6.0 



11 



9 



11 



12 







Slight 

 7 



12 



13 



6 



4.00 

 4.30 

 4.76 

 1.65 



4,60 

 5.56 

 6.50 



1.82 



8.60 



9.86 



11.26 



3.47 



7.0 



10.0 



9.0 



5.0 



12 



12 



14 



6 



Magnesium and barium 



With Canada field peas it was found tliat magnesium and barium anti- 

 dote each other. The action is not great, however. Furthermore, as 

 exhibited by the data, this antitoxic action is more evident when growth of 

 roots is considered alone than when growth of both roots and tops is 

 considered. 



In this series N/800 MgCl2 is approximately the lethal concentration, 

 and in a solution of N/4000 BaCl2 the root growth is slightly less than in 

 distilled water. When magnesium and barium are offered together as 

 N/800 MgCl2 and N/4000 BaCl2, the development is much greater than 

 in distilled water. When a stronger solution of barium is combined with 

 magnesium the solution is toxic. On the other hand, when N/800 MgCl2 

 and N/6000 BaCl2 are mixed in solution, the poisonous action of the mag- 

 nesium is not appreciably reduced. 



