18 THE IMPORTED ELM LEAF-BEETLE. 
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 cannot 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 vessel 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 fine mist desired, and lacking the side 
discharge, &c, was afterward learned of as being used in California. 
(See U. S. Agricultural Department Eeport, 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 ex- 
tension-pipe is convenient for underspraying all kinds of low plants. 
