172 Principles of Plant Culture. 



a rigid handle and a tight-fitting cover (Fig. 68). For 

 small plants, as young potato tops, the tin disc A which 

 has a circular hole in the center, is laid inside on the 

 bottom of the box, and held in place by small lugs 

 soldered to the wall as shown. When it is desired to 

 spread the powder more, the disc B is used. 



For taller plants, a powder bellows is desirable. 



Liquids are best distributed with a force pump, fit- 

 ted with a hose of a length suitable to the height of the 

 tree or plant, and with an atomiz- 

 ing nozzle (Figs. 69, 70, 71). For 



FIG. 69. FIG. 



FIG. 69. A convenient and serviceable spray pump, using a 

 common pail for a reservoir. 



FIG. 70. A similar pump with attachment by which kerosene 

 and water may be sprayed together (294). Both are made by 

 the Deming Co., Salem, Ohio. 



tall trees, the hose nozzle may be elevated by attaching 

 it to the end of a light pole. In orchard spraying, the 

 pump is often used on a wagon, and the man holding 

 the hose sometimes stands on a high platform. A spray 

 pump used on a large reservoir, needs an agitator to 



