Dandeno — delation of Mass Action to Toxicity. 445 



were taken from the solution and fresh seedlings put in their 

 places in the same solution. In column 3 is recorded the 

 growth of seedlings during one day, — the second day the seed- 

 lings were used. These were, of course, the same solutions 

 which had been used the previous day. This was continued 

 for eight days. In column 6 is the recorded growth for two 

 days. In all other cases the growth is for a period of twenty- 

 four hours. The same solutions, therefore, were employed for 

 eight days, and seven series of fresh seedlings were used in 

 the test. 



X. Corn, HC1, n/1024. 



1. 







Growth at trie end of 







Quantity of 

 solution. 









_j^_ 









2 



3 



4 



5 



6 



7 



8 





ldy 



2dy 



3dy 



4dy 



6dy 



7dy 



8dy 



25 cc 































20 































12 















17 



12 



8 



23 



8 















14 



20 



13 



28 



5 







8 



3 



9 



10 



* 



* 



H 







8 



20 



22 



IS 



* 



* 



i 



8 



10 



2 



24 



* 



* 



* 







XI. Corn, H 2 S0 4 , n/1024. 







l. 





i 



Growth at the end of, 







Quantity of 

 solution. 









_. 









2 



3 



4 



5 



6 



7 



8 





ldy 



2dy 



3dy 



4dy 



6dy 



7dy 



8dy 



25 cc 































20 



















8 



5 



10 



12 















6 



6 



8 



25 



8 











10 



24 



16 



7 



24 



5 







14 



15 



22 



8 



* 



* 



9i 







12 



30 



22 



20 



* 



# 



1 



5 



14 



13 



20 



* 



* 



* 



From these tables it seems reasonably clear that quantity of 

 solution bears certain relations to toxic action. In Table I is 

 shown a sort of limit in quantity, somewhere between 2^- and 

 5 CC , the seedlings plainly living in quantities of 1 and of 

 2-| cc ; while they just as plainly died in quantities ranging from 

 5 CC up through 25 cc . The action is probably a chemical one, 

 resulting from the substances supplied to the solution by the 

 plant ; or, it may possibly be a physical action produced upon 

 the solution by merely extracting certain substances mechan- 

 ically from the solution. It is by no means easy to decide which 



* No tests were made, as growth was quite evident. 



