272 Raymond H. Pond. 
TABLE IX, 
MERCURY. 
M. Control. Enzyme. + Increase. 
32768 0.00 0.00 0.00 
16384 0.05 0.05 0.00 
8192 0.07 0.07 0.00 
SILVER 
32768 0.00 0.10 0.10 
16384 0.00 0.05 0.05 
8192 0.00 0.03 0.03 
Enzyme, 0.0125 per cent. Incubation period, 4 hours. 40° C. 
Since this test did not locate the limit for either salt, another was 
made the following day. In this latter test a repetition of the preced- 
te (all conditions being the same), the mercury showed total inhibi- 
tion in concentrations 8192-65536 inclusive. The figures for the 
silver are as follows: 
TABLE X. 
SILVER. 
M. Control. Enzyme. Increase. 
32768 0.00 0.10 0.10 
16384 0.00 0.05 0.05 
8192 0.00 0.02 0.02 
4096 0.00 0.00 0.00 
This leaves the limit for mercury still undetermined while the figures 
for silver are almost identical with those found in the preceding test. 
The following experiment locates the limit for mercury and confirms 
antecedent figures for silver. All conditions are repeated as in the 
preceding test. 
TABLE XI. 
MERCURY 
M. Control. Enzyme. Increase. 
262144 0.00 0.05 0.05 
131072 0.00 0.02 0.02 
65536 0.00 0.00 0.00 
32768 0.00 0.00 0.00 
SILVER. 
65536 0.00 0.10 0.10 
32768 0.00 0.10 0.10 
16384 0.00 0.05 0.05 
192 0.00 0.02 0.02 
