

450 Dandeno — Relation of Mass Action to Toxicity. 



Vl.a, KOH. 



n/32 



A B 



Pea .„ 



Lupine _... 



Corn _ 



VII. a, NaOH 



n/'S2 



A B 



Pea 



Lupine 



Corn o 



VIII. a, Na 2 C0 3 



»/8 

 A B 



Pea 



Lupine 



Corn 



IX.a, NaHC 



n/4 

 A B 



Pea 



Lupine o 



Corn . _ 



A comparison of data taken from Tables II-IX (those in 

 which radicles were immersed in liquid) with those'taken from 

 Tables Ila-IXa (tnose where radicles were immersed in sand 

 and liquid) may help towards a clearer notion of the action 

 produced by a non-chemical body. In making comparisons, 

 the actual mass of solution used was arranged so as to have, as 

 nearly as possible, the same in each case, with a view towards 

 eliminating every element of inequality excepting the one 

 under consideration. It proved, however, that a difference in 

 quantity, ranging from 3-J cc to 6 CC , of actual liquid used, when 

 mixed with sand, produced no noticeable difference in action 

 upon the radicles. 



In solutions of HC1 and H 2 S0 4 , n/512, all seedlings men- 

 tioned, live with at least 3 CC of liquid, when sand is present ; 

 but in liquid alone, similar seedlings, under similar circum- 

 stances, can scarcely endure a concentration of 7^/2048, or in a 

 ratio of 4 : 1. This shows that the actual physical effect of the 

 sand was equivalent to a neutralizing reaction of 9/2048 cc nor- 

 mal acid in l cc of solution, because the seedling lived in a 

 solution 3/512 cc , or 12/2048 of normal acid to l cc of solu- 



n/64 



n/128 



A B 



A B 



3 



10 12 



4 



11 5 



12 10 





w/64 



n/128 



A B 



A B 



1 



18 16 







6 4 



11 10 



17 11 



3- 



n/W 



n/38 



A B 



A B 







8 5 



2 



9 7 



5 



28 11 



3- 



n/8 



' n/16 



A B 



A B 







8 9 



3 



6 7 



15 11 



2 2 



