536 Bulletin 78. 



left in an open or uncorked vessel ; we find large glass bottles 

 with tight-fitting corks the best receptacles for it. The vapor is 

 very poisonous and great care should be taken in pouring it out 

 not to breathe much of it. As the vapor is also very explosive, 

 no lights of any kind should be brought near when it is being 

 used. Treat it with more care than you would gunpowder, in 

 this respect. The best and cheapest brand now on the market is 

 that known as " Fuma Carbon Bi-Sulphide," manufactured by 

 Edward R. Taylor, Cleveland, Ohio. He ships it in 10 lb. cans 

 at 12 cents per pound, or in 50 lb. cans at 10 cents per pound. It 

 can be obtained in small quantities at drug stores, but usually for 

 not less than 25 cents per pound. 



Thus cabbage plants can be treated once, and once is usually 

 sufficient, at the rate of about 10 plants for i cent for the liquid, 

 using about i teaspoonful to each plant. As the injector will last 

 for years, and several neighbors might join in the purchase and 

 use of one instrument, its cost would practically not influence this 

 estimate of the cost of killing the maggots. We believe it is the 

 cheapest, most effective, and most practicable method yet devised 

 for fighting this pest on crops of cabbages and cauliflowers ; on 

 crops of radishes, turnips, or onions it will probably be too expen- 

 sive except where choice or new varieties are attacked. The Car- 

 bolic Acid Emulsion will prove the most practicable on these last 

 crops. 



The method of inserting the injector is shown in figure 18. 

 The hole should always begin at a distance of 3 or 4 inches from 

 the plant and run horizontally downward to a point a little below 

 the roots. To accomplish this, the injector must be inserted at 

 an angle as shown in the figure. Force it down until you think 

 the point is a little below the roots, then let out the charge of 

 liquid. In operating the injector, first pull the piston upas far as 

 it will go ; this loads the measuring chamber between the valves ; 

 then push down the piston until it stops, and the instrument is 

 ready to be pushed into the ground. Push it into the ground as 

 far as desired, hold it there while you pull up the piston ; by this 

 operation you let the charge out of the lower chamber into the 

 ground, and at the same time the measuring chamber is again filled. 

 Hold the injector in the ground a few seconds after the piston has 



