REMEDIES AND PREVENTIVES. 219 



For an orchard the apparatus must of course 

 be more powerful. It is usual to mount a bar- 

 rel containing the fluid, upon wheels, with one 

 man to pump, another to direct the spray, and 

 a third to lead the horse. In order to reach the 

 tops of high trees, the spraying hose may be 

 attached to a bamboo pole of suitable length. 

 With such apparatus a large orchard can be 

 quickly done. Recommendations for the treat- 

 ment of diseases of the various fruits have 

 already been given. The following formulas 

 are here given. 



INSECTICIDES. 



Paris-green. — The commercial article con- 

 tains from thirty to fifty per cent, of arsenic. 

 It is practically insoluble in water, and tliere- 

 fore it is necessary to keep the mixture con- 

 stantly stirred to prevent settling. Serious 

 injury may result to foliage if the liquid be- 

 comes too strong at the bottom. For apples, 

 pears, potatoes, and most shade trees, one 

 pound should be diluted with 250 gallons of 

 water. For cherries and peaches, from 300 to 

 400 gallons should be the proportion. Kero- 

 sene emulsion (one gallon of sour milk, two 

 gallons of oil) may be added to the arsenite 

 in the proportion of one per cent, to increase 



