232 Minnesota Plant Diseases. 



daily for spraying high shade trees, stationary engines have 

 been used. 



In the application of powders, apparatus is also necessary. 

 Blow guns, pepper shakers and powder guns of various kinds 

 are in use. Figure 115 shows a powder gun in very common 

 use, together with various accessories and attachments. 



Machines have recently been devised for the treatment of 

 oats and other grains against smuts. Such machines aim to 

 completely immerse the grains in the solution and to keep them 

 agitated so that all parts of the grain surface are reached by 

 the fungicide. 



The above pretends to be only a general and elementary 

 exposition of the general types of machinery in use at the 

 present time. For further information and detail the reader is 

 referred to the Minnesota State Entomologist's Report for 

 1904 and to other Agricultural Experiment Station literature. 



