40 



DISEASES OF ECONOMIC PLANTS 



small garden or a large commercial orchard. In either 

 event proper apparatus is needed. A machine of good 

 quality is more durable and cheaper in the end. 



In selecting a pump the fol- 

 lowing points^ should be given 

 consideration : — 



1. The air chamber should be 

 sufficiently large to ensure a 

 steady spray and be so placed on 

 the pump that the latter will not 

 be rendered top-heavy. 



2. Some means of keeping the 

 spraying mixture thoroughly 

 stirred is essential. 



3. The working parts should 

 aU be of brass and be so arranged 

 that they can be examined with- 

 out undue difficultj^ 



4. The pump when mounted 

 should not extend above the bar- 

 rel more than is necessary. 



5. It is desirable to have the 

 device for attaching the pump to 

 the barrel so arranged that the 

 pump can be readily mounted 



on, or removed from, the barrel. 



6. The different parts of the pump should be so con- 

 structed that they can be readily taken apart, especially 

 those which inclose the valves. 



7. All points for attachment of the hose should be cut 

 with threads of standard size. 



Fig. 11. — Bucket pump showing 

 hose, nozzle, and bucket attach- 

 ment. After Gould Mfg. Co. 



1 Modified from the Maryland Agr. Exp. Sta. Rpt. 13, p. 73, 1S99. 



