19 o8] 



POND— SOLUTION TENSION AND TOXICITY 



237 



Tx\BLE IV: Barium and magnesium in contemporaneous test 



BARIUM 



m 



Control 



Water 



128... 



64... 



32... 

 16... 



8... 



Enzyme 



Increase 



O 



o 



o 



o 

 o 

 o 



10 



10 

 10 

 10 

 10 



10 



0.22 



O. 22 

 0.20 

 0.18 

 0.17 



o. 16 



0.12 

 0.12 

 o. 10 



0.08 



0.07 

 0.06 



MAGNESIUM 



Enzyme 0.05 per cent. Incubation 4.5 hours at 40 C. 



bition seems to be impossible for this concentration of the enzyme 

 as m/4"of the salts is almost saturation at room temperature. In this 

 test the two salts are certainly equitoxic. 



TABLE V: Barium and strontium in contemporaneous test 



BARIUM 



m 



Control 



Enzyme 



Increase 



Water 



128... 



64... 



32... 

 16... 



8... 



o 

 o 

 o 

 o 

 o 

 o 



13 

 13 



13 



13 



13 



^3 



0.27 

 0.27 

 0.24 



0.22 

 0.20 

 0.16 



0.14 

 o. 14 



O.II 



0.09 



0.07 



0.03 



STRONTIUM 



128 



64 



32 

 16 



8 



0.13 



0-13 

 0-13 

 013 

 0.13 



Enzyme o . 05 per cent. Incubation 5 hours at 40 C. 



am 



IV however shows inconstancy 



Table IV allows o . 06 as compared with o . 03 in Table V 



Comparison with 



/8 of barium in 



On the 



uninhibited 



:ty, 



ure indicatincr full activity in 



in Table V, and yet m/8 barium inhibits more In the latter than 



