174 



PEACH LEAF CURL: ITS NATURE AND TREATMENT. 



to these changes Mr. Gunnis says that he is now building from nis 

 own designs, and has almost completed, a small gasoline engine of 3 to 

 4 horsepower, weighing less than 200 pounds. This engine is intended 

 for use with a spraying machine embodying all the features of his old 

 apparatus, but lighter and more compact. He also has plans under 

 way for a self-propelling machine, in ^vhich the extra power required 

 will not cost half of what it does to feed a team, and which can be 

 much more easily controlled. 



Fig. 9. — Spray pump for general orchard work, upright lever. 



PI. XXX shows the right and left sides of Mr. Gunnis s sprayer 

 as it appeared after the addition of the rotary pump for filling the 

 spray tank. A detailed description of this machine was prepared by 

 Mr. Gunnis and published in the Yearbook of the Department for 

 1896 (pages 73 and 74), in an article by L. O. Howard, on the use of 

 steam apparatus for spraying. Those wishing more complete details 

 may refer to Mr. Gunnis direct, to whom the writer is indebted for 

 the illustrations and facts here given. 



