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Experiment 5.—The duplicate of Experiment 4, with the same 
results. In an hour and twenty minutes, the larve were removed 
from the earth and showed no signs of hfe. Seven hours later, 
when examined, they were evidently quite dead. 
Tbe foregoing experiments demonstrate that exposure to the vapor 
of bisulphide of carbon, in the earth, will destroy the root-worm, 
provided the vapor is sufficiently concentrated. A teaspoonful of the 
bisulphide poured into a small hole three inches deep, and after- 
wards filled with earth, would apparently destroy all the larve 
within an area at least six inches across. The season of the year 
prevented a verification of these experiments in the open field, and 
it is possible that it will be found, in practice, that the wooden sides 
of the box served to confine the vapor, and that a single applica- 
tion would prove effective in practice only over a smaller area. 
In France, where this substance has been the subject of innu- 
merable experiments for the destruction of the root form of the 
erape phylloxera, it has been found desirable to use it in such forms 
as to prevent its too rapid evaporation and escape from the soil; 
as, When this condition is observed, it is at once less liable to 
injure the plant, and more likely to destroy the insect. To this 
end, it has been combined with other substances in the form of 
solid cubes, or mixed with absorbent powders, like diatomaceous 
earth, or tripoli. Lately, the sulpho-carbolate of potash has been 
found a convenient and effective substance for administering the 
bisulphide of carbon and carbolic acid in combination. 
Carbolic Acid. 
Experiment 6. arva of Scelodonta was placed 
under a glass dish with a bit of sponge moistened with a little strong 
carbolic acid. In seventeen minutes this larva showed signs of 
uneasiness, and in twenty-five minutes more, was apparently dead. 
In an hour and twenty minutes after treatment it was taken from 
the dish, and three hours later was dead and discolored. 
Experiment 7.—Two root-worms were placed in thin muslin and 
buried near the bottom, at one end of a crayon-box, as described 
in the above experiments with bisulphide of carbon. These were 
treated with about a teaspoonful of carbolized water poured into a 
hole near the opposite end of the box. In nineteen hours they were 
removed from the earth and found to be dead. Fifteen hours after- 
wards they showed no signs of recovery. 
Experiment 8.—In this experiment, which was precisely Rie the 
preceding, the result was unfavorable. The larve were not exam- 
ined until forty hours after treatment, and at that time were both 
alive. 
Experiment 9.—In this experiment, which was similar to the pre- 
ceding, the two larve were found alive an hour and forty minutes 
after being treated, and were returned to the box again. Carbolized 
water was again administered, as before, but in six and one-half 
hours both root-worms were still alive. 
