SPRAY PUMPS 177 



the most convenient thing made for the man with a garden and 

 dwarf or otherwise small trees. It is also especially good where 

 a man wants to go over the trees in a young orchard in search 

 of occasional trees affected with the tent-caterpillar or with the 

 red-humped apple caterpillar. It is handy to get about with, 

 one man can handle it, it agitates the liquid well and maintains 

 a good pressure. On the other hand, it is heavy to carry about, 

 particularly in the late afternoon if one has been using it all 

 day ; it requires filling rather frequently, and it has an unpleasant 



FIG. 78. A barrel outfit with a collapsible ladder; excellent for working among old trees 



which hang low. 



habit of slopping and wetting the operator in the small of the 

 back. On the whole it is a very efficient little pump, but, like 

 most sprayers, it is more comfortable to ' ' use it by proxy. ' ' 



III. The barrel pump (Figs. 78 and 79) is by all odds the most 

 generally satisfactory of all the spraying machines. It is 

 adapted to more different circumstances, and a good one will 

 always give a good account of itself. If a man has only a few 

 trees he can combine with one or more neighbors and the cost 

 of the barrel pump will not be great for each one of them, 

 while the satisfaction in using it will be great. On the other 

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