No. 4.] SHADE-TREE INSECT PROBLEM. 



101 



for hose. The bill for such apparatus would be about as 

 follows : — 



1 hand-lever pump with air chamber, mounted in 



a 50-gallon cask, $15 00 



100 feet half-inch white cotton hose, at 10 cents, . 10 00 



1 8-foot i-inch gas pipe pole extension, . . . 1 00 



1 Vermorel nozzle, 60 



$26 60 



Concerning the pump, it may be said that any of the 

 standard makes, operated b}^ a lever and having an air cylin- 

 der of one and a half inches or more in diameter, a stroke 

 of five inches or more and a suitable air chamber, will give 

 sufficient force for the spraying of even tall elms ; and, as 

 already indicated, the outfit, if properly cared for, would be 

 suitable for orchard and garden work for a term of years. 



On large estates or in the case of parks or street trees a 

 more powerful outfit will be required. For economy of 

 labor, the pump should be capable of supplying at least four 

 lines of hose. It should have a large air chamber to regu- 

 late the pressure, and its construction should be so simple 

 yet rigid that it can be operated by one able-bodied man. 

 Such a pump has been recently offered in the market and 

 tested in park work at Ipswich, Mass., with most satisfac- 

 tory results. The bill for this outfit would stand about as 

 follows : — 



$54 70 



Where four lines of hose are to be used, the items for 

 spray poles, hose and nozzles should be doubled. This out- 

 fit will effectively spray the tallest trees, and will readily 

 operate four lines of hose where it is desirable. 



One of the best outfits ever devised for park or street 

 work is the one formerly in use by the gypsy moth com- 



