24

     The test dose of each poison, namely, an amount which clotted the control
in a few minutes, was mixed with varying amounts of serum. The mixtures were
allowed to stand at laboratory temperature for half an hour. Then into each
tube there were run 2 c.c. of citrate plasma. A control tube without serum was
prepared in each instance.

     The following results were obtained.

     It is evident from these experiments that C. V. serum cannot prevent the.
clotting action in vitro of any of these four venoms.

TABLE XVIII.—Experiments to ascertain if H. C. V. serum can neutralise
     the actions of the venoms of (z) Hoplocephalus curtus, (2) Echis carinata,
     (3) Trimeresurus giamineus and (4) Crotalus adamanteus on citrate
     plasma in vitro.

     The same technique was used as was employed in the observations detailed
on Table XVII. The following were the results.