iyo8] 



POND—SOLUTION ThNSION AND TOXICITY 



T.MiLI", XI 1 1 : Mercury an J silver in content jioraneons test 



MKRCURY 



244 



SILVER 



Enzyme 0.05 per cent. Incubation 5 hours at 40- C. 



In this test mercury is more toxic than silver, even on the equi- 

 normal basis, though the difference here is not nearly so great as was 

 found with ethyl butyratc. Of course the greater concentration of the 

 enzyme used here introduces a factor in addition to that of the different 

 zymolytc. Mercury in comparison with silver is like copper in com- 

 pari.son with zinc in regard to precipitating power. The point of 

 total inhibition is close to that of the first appearance of a precipitate, 



TABLE XIV 



MERCURY 



SILVER 



Enzyme 0.05 per cent. Incubation 5 hours at 40° C 



