Solution Tension and Toxicity in Lipolysis. 269 
Zinc, lead, and copper in contemporaneous test. — 
TABLE V. 
ZINC. 
M. Reagent. Control. Enzyme. Increase. 
1024 0.20 0.30 fe) 05 
512 0.45 0.45 0.45 0.00 
256 0.90 0.90 0.90 0.00 
128 1.70 1.70 1.70 0.00 
LEAD 
aoa 4 0.10 0.20 0.25 0.05 
b taal 0.20 0.30 0.30 0.00 
256 0.45 0.60 0.60 0.00 
128 0.90 1.10 1.10 0.00 
COPPER. 
1024 0.20 0.20 0.30 0.10 
bated 0.40 0.40 0.40 0.00 
256 0.70 0.80 0.80 0.00 
128 1.40 0.00 
1.50 1.50 
Enzyme, o.o12 5 percent. Incubation period, 5 hours. 40° £3. 
In this test the three salts are certainly of equal toxicity. The 
acidity of the control tends to be greater than that of the plain ai 
agent, but this will be discussed later. It will be noted that the point 
of total inhibition for zinc is the same as in the preceding test, mn 
which the incubation period was eighteen hours. This change in the 
incubation period does not materially change the relative toxicity 
even of different groups. A precipitate fell in each case at or near 
the neutral point. 
Copper and zinc in contemporaneous test. — To show how closely 
the figures in successive tests will agree the results of two other tests 
with these salts will be given. 
SABLE: ¥L 
Copper. 
Reagent. Control. Enzyme. Increase. 
0.10 0.15 0.0 
0.20 0.20 0.20 0.00 
c.40 0.40 0.40 0.00 
970 0.80 0.80 9.00 
