340 THE NEW GARDENING 



constant pumping necessary with the old type of machine, 

 but against this must be set the periodical labour of 

 forcing in the air. While working on foot the operator 

 would perhaps prefer the pumping machine, on a ladder 

 in the trees he would find the compressed air type more 

 convenient. 



To get the full advantage of the latter, two or more 

 should be in use simultaneously, then one employe can 

 be kept at the task of charging and others proceed with 

 the spraying. 



