December, 1909.] 



THE CODLING MOTH. 



85 



ti. Then.' slumld be a good niecluiuical agitator ol' the paddlo 

 type, preferably arranged so that it can be worked with the 

 pump handle without operating the pump. An agitator is essen- 

 tial to keeping the mixture in suspension. Agitators of the 

 so-called "jet" type, in whieh a stream from the bottom of the 

 cylinder is supposed to agitate the liquid, are unsatisfactory 



Fig. 16.— Niagara gas sprayer outtit used in experiment.s at Durham. 



and allow a loss of pressure without sufficiently agitating the 

 liquid. 



7. The pump should be attached to the barrel so that it may 

 be quickly removed for repairs. 



8. The valves, with their seats or cages, should be readily 

 detachable for cleaning, and should be so constructed that they 

 will grind themselves evenly. 



Possibly all of these points will not be found in any one pump, 

 but the better pump companies, in their newer models, are 

 adopting most of the above features. Such a pump with hose, 

 nozzles and rod, should cost $15 to ii^3(». A thoroughly reliable 

 pump cannot be bought for less and if you are induced by your 

 local dealer to buy a pump retailing for $10 or less you will soon 

 find it unsatisfactory and give it up for a better one. A pump 



