SPRAYING 



235 



formula. It is also much more economical from the standpoint 

 of time and labor to prepare it in quantity. The mixture can be 

 prepared in quantities four to five times that of the standard for- 

 mula if one has a vessel large enough, but such quantities cannot 

 be prepared in an ordinary barrel, for in this case they cannot be 

 kept properly stirred while the lime is slaking. 



First moisten the sulphur with water, breaking up all lumps 

 and stirring thoroughly to form a thick paste. Place the lime in 



Fig. 107. Spraying trees in Colorado 



A two-and-one-half horse-power engine, a 150-gallon tank, three men, and a pair of horses 

 will cover a large number of trees with spray material in a day 



a barrel and add just enough water to start vigorous slaking. As 

 soon as the slaking is well started, add the moistened sulphur. Stir 

 the mixture continually, adding sufficient water to maintain a thin 

 paste to keep the lime actively slaking and yet prevent burning. 



Quick, active-slaking lime should be used in preparing this 

 mixture, because lime which is sluggish does not produce sufficient 

 heat. If the lime does not slake readily, warm water should be 

 used ; otherwise cold water will be found satisfactory. The lime 

 should supply heat enough to boil the mixture violently for several 



