Dandeno — Relation of Mass Action to Toxicity. 443 



The columns in the following tables (I-IX), under concen- 

 tration used, are divided into four parts, and these are sub- 

 divided, — A, B, C, D. In the column A is given the number 

 of cubic centimeters in which the radicles plainly lived and 

 grew. In B is given the number of cc. in which the radicles 

 died. Column C contains the average number of mm. the radi- 

 cles grew during twenty -four hours' immersion in the solution 

 used. This number is not the maximum average, that is to 

 say, it is not a measure of the growth which might be obtained 

 in a quantity of solution much less than the one given in col- 

 umn A. In column D is recorded the average growth obtained 

 in twenty-four hours when the radicle was in water, after hav- 

 ing been taken from the solution. This also refers to the 

 seedlings grown in a quantity as indicated in A. 



II. H 2 S0 4 . 







n/1024 







n/2048 





i 



./4096 







n/8192 







t 

 A 



B 



c 



D 



A 



B 



C 



D 



A B 



C 



D 



A 

 12 



B 



25 



C 

 3 



D 



Pea 







H 



5 



5 



5 



5 



8 



7 



4 







Lupine 











5 



8 



5 



7 



12 



20 



2 



6 



25 





7 



9 



Corn 



1 



H 



5 



14 



12 



20 



5 



10 



20 25 



5 



2 











III. HC1. 







n/1024 







n/2048 





n 



/4096 







n/8192 







A 



B 



C 



D 



A 



z 2 



B 

 5 



C 



D 



A 



5 



B 



8 



C 



8 



D 

 4 



A 

 12 



B 

 20 



C 

 8 



D 



Pea 









12 



13 



2 



Lupine 











24 



5 



12 



22 



5 



8 



3 



S 



20 



25 



8 



3 



Corn 



1 



91 



z 2 



8 



10 



\n 



5 



12 



10 



12 



20 



6 



3 



25 





13 



3 



IV. H 2 C0 3 .* 



Pea 



Lupine 

 Corn 





n/1 



[71 





] 



n/343 





n/5 



13 











A 



B 



C 



D 



A 



B 



C 



D 

 12 



A 

 25 



B 



C 

 12 



D 

 15 









20 



25 



11 



25 





7 



3 

























25 





16 



35 



1 















I 



















V. C 



L1SO4 





















I 



n/32768 



n/65536 



n/131072 



n/262144 





A 



i 2 

 5 



B 



C 



1 

 D 







6 



1 



A 



B 



C 



18 



7 



D 



30 



A 



B 



c 



D 



A 

 25 



20 



B 

 25 



C 

 10 



7 



D 



Pea 



Lupine 

 Corn 1 



5 



12 



16 



4 



8 

 25 



12 



12 



1 



20 



H 



4 



3 





 13 



6 



8 



* This is considered a divalent acid, though Cameron regards it as a mono- 

 valent acid (HCO3). 



Am. Jour. Sci. — Fourth Series, Vol. XVII, No. 102. — June, 1904. 

 30 



