No. 4.] SPEAYING OF CROPS FOE PEOFIT. 267 



There are many good pumps and nozzles to be had at rea- 

 sonable prices, any one of which will be a good investment 

 to the farmer, fruit grower or gardener. We cannot advo- 

 cate any one pump as superior to all others. All pumps of 

 whatever kinds in which copper sulphate is used must be 

 made of brass, as iron would be soon so corroded as to be 

 worthless. 



Kinds of Pumps. 



The pumps in most general use may be put in four 

 groups : ( 1 ) the hand pump, either the syringe or pail pump 

 or atomizer (figs. 1 and 2) ; (2) the knapsack (fig. 3) ; (3) 

 the barrel pump (figs. 4 and 5) ; and (4) the machine 

 pump.* 



The Hand Pump. — For garden work, where only a few 

 plants, shrubs or small trees are to be protected, the com- 



mon hand pump represented by fig. 1 (without the kerosene 

 attachment) will be found suflScient. 



The atomizer (fig. 2), of which there are many forms that 

 are practicall}^ the same in construction and utility, is very 

 useful and inexpensive. For the use of the Bordeaux mix- 

 ture or copper sulphate solution it must be made of brass or 

 copper. 



The knapsack (fig. 3) is useful when a larger amount of 

 shrubs or small trees are to be treated, and when they are 

 too closely planted to allow the barrel pump to be driven 

 through on wheels or on a stone boat. These pumps hold 

 about five gallons, and can be easily carried on the back. 

 The main objection to them is the cost, which is from twelve 

 to eighteen dollars, complete, with hose and nozzles. 



* Editor's Note. — Attention is called to the article "Improvements in spray- 

 ing machinery," inclnded in the report of tlie gypsy moth committee of this Board, 

 and to be found on pages 469-474 of " Agriculture of Massachusetts " for 1898. 



