EFUMIGATION WITH CARBON BISULPHID 267 
depth of about one foot ; the central plunger is then 
pressed down and the desired amount of the liquid is 
discharged ; the instrument is withdrawn, and the hole 
closed with the foot, or, as is usual in extensive work, 
another workman follows with a rammer, with which 
the holes are closed, and the soil at the same time is 
firmly compacted. It is said that two men working 
together in this way can make between 2,000 and 3,000 
injections per day. One acre will require on the aver- 
age from 10,000 to 12,000 holes. Plows have also 
been devised for injecting carbon bisulphid into the 
the soil, but they are not altogether satisfactory. The 
same methods can be applied to other subterranean 
insects and underground creatures. 
Root-maggots and root-worms.—Both the larvee and 
pupze of the cabbage root-maggot are destroyed with 
carbon bisulphid. Prof. M. V. Slingerland, of Cor- 
nell University, has determined these points with 
accuracy, giving the details of his experiments in bul- 
letin form. (Bulletin No. 78, Cornell University Ex- 
periment Station.) Where used for the root-maggot 
the hole should start 3 or 4 inches from the stem of 
the plant and run down obliquely a little below the 
roots, where the liquid is deposited. The dose re- 
quired varies from a teaspoonful for each small plant 
to a tablespoonful for large plants, an equivalent of 
about one-quarter of an ounce in the former case and 
one ounce in the latter. One injection will be sufficient 
if made in time. The conditions of the soil noted 
under phylloxera treatment will have practically the 
same influence in this case. 
A similar method of treatment will be equally 
