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JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



as well as living insects, and rids the trees of lichen. In summer-time 

 for most of these insects (except scale) some such spray as kerosene 

 emulsion or whale-oil soap is used. 



The usual mode of application of the afore-mentioned wash is a pump, 

 having an air chamber, fitted into a 40-gallon paraffin cask, or, better 



Fig. 221 — Spraying Large Apple Thkes. 



still, into a 100-gallon one. A pump with the air chamber inside the 

 barrel is most convenient, as taking less spaca and less likely to strike 

 against the trees, and more readily balanced. The best pumps have some 

 automatic system of stirring the liquid. The hose pipe, from 9 to 15 



