22 



OUR SHADE TREES AND THEIR INSECT DEFOLIATORS. 



may surround the pole proxiinally from the spray, aud the drip will drop 

 off from its margin. Such an arrangement is- indicated at J in Fig. 4. 



While one person operates the pump, 

 another, standing in the vehicle or 

 upon the ground, directs the spray by 

 the stiff part of the pipe. Thus the 

 operator can not only spray higher and 

 lower with convenience, but he can, to 

 a great extent, move the spray from 

 place to place without leaving his own 

 position and without moving the ves- 

 sel of poison with the pump. 



The hose and bamboo combination 

 was conceived of, and used as the 

 lightest, long, stiff tube practicable 

 for these purposes, and it has answered 

 admirably. A similar pole, with a 

 metallic tube in its interior, with a 

 nozzle not producing the very tine 

 mist desired, and lacking the side dis- 

 charge, &c, was afterward learned of 

 as being used in California. (See Agricultural Department Report, 

 1881-'82, p. 208.) 



By the apparatus used, when everything is prepared, a tree can be 

 sprayed quickly, and a large grove is treated in a short time. It is 

 equally adapted for forestry use in general, and likewise available for 

 poisoning on fruit trees, when not in fruit, while the shorter style of 

 extension-pipe is convenient for underspraying all kinds of low plants. 



Fig. 



.—Eddy-chamber nozzle, natural size; 

 face view and section. 



