FUMIGATION 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 discharged ; the instrument is withdrawn, and the hole 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 larvae and 

 pupae 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 



