The Cabbage Root Maggot. 



537 



been pulled up in order that all the liquid in the charge may have a 

 chance to run out. Then pull the injector out of the ground, and 

 quickly, with the foot, fill the hole with earth and step on it to 

 pack it down. Press down the piston, and you are ready to treat 

 the next plant. Never push the injector in the ground unless the 

 piston is clear 

 down, because 

 if the lower 

 end is not thus 

 closed, it will 

 immediate] 3^ 

 fill with soil 

 which is not 

 easily re- 

 mo ved. Study 

 the drawings 

 in figure 17 in 

 connec t ion 

 with these di- 

 rections and 

 you will un- 

 derstand the 

 reason for 

 each step. We 

 would advise 

 that the reser- 

 voir be first 

 filled with 

 water and the 

 injector oper- 

 ated above the ground until each step is thoroughly under- 

 stood. There is nothing complicated about the instrument, or 

 the way it is to be operated. It can be easily taken apart and 

 cleaned if necessary ; the only caution to be observed in replacing 

 the parts is to have the flanges of the leather in the upper valve 

 turned upward. 



We recently tested the effect of the liquid on some young cab- 

 bage plants not yet large enough to set in the field. A table- 



FiG iS. —T/ie McGowe?i Injector, and hoiv to use it. 



