194 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 4 



There is spraying apparatus of ail kinds and sizes, and the selection 

 of an outfit is, therefore, based on its service requirements. Beginning 

 with the smallest of all, the bucket pumps which may be had for a few 

 dollars, the sizes and costs will increase on a more or less graduated 

 scale up to the 200-gallon power pumps which cost several hundred 

 dollars. 



Strong competition in the spray machinery business is responsible 

 for the rapid improvement in the construction of pumps and acces- 

 sories. It is now possible for the purchaser to obtain good, durable 

 and efficient pumps from a number of manufacturers and at a cost 

 entirely commensurate with their value. Individual operators have 

 a large field in which to exercise their choice, though such choice would 

 necessarily be founded more upon some peculiar mechanical device 

 than upon cost. 



Bucket and Knapsack Pumps 



These two styles are grouped together because their field of useful- 

 ness is so limited. With sufficiently long leads of hose they may be 

 used on small orchard trees, but they are designed and built ostensibly 

 for use in spraying greenhouse plants and shrubs. Their relatively 

 small cost places them easily within reach of all who have ornamental 

 plants to protect, both indoors and out, from scale insects, and in this 

 field they make valuable acquisitions to the garden, the greenhouse, 

 and in the growing of small ornamejital plants. 



The bucket pump as a rule is constructed so as to extend into the 

 bucket, to which it is attached by a clamp : a foot piece extends to the 

 ground and by placing the foot upon this the pump is held in position 

 while it is being worked. The cost varies from $5 to $10. 



The knapsack pump being more portable and somewhat larger, is 

 a more desirable contrivance for use in the sphere above assigned to 

 the bucket pump. It is attached to the back after the fashion of a 

 knapsack and is worked by a lever extending over the operator's shoul- 

 der. The details of construction vary between the different manufac- 

 turers, but the general plan is much the same in all. They are of five 

 gallons cap'acity and are equipped with 3-8-inch hose to which any 

 style nozzle may be fitted. The tanks are made of brass or galvanized 

 iron and the prices are governed by the metal used in their makeup. 

 The list prices vary from $10 to $18. 



Barrel Pumps 



Barrel pumps, as the name denotes, are pumps intended for mounting 

 in barrels, and their size, cheapness and general efficiency for spraying 

 on both large and small scale make them, perhaps, the most important 



