SPRAYING 



81 



most efficient spray for that purpose. The recipe is 

 as follows : 



Fresh stone lime, 16 pounds 



Flowers of sulphur, or sulphur flour, 15 pounds 

 Water, 40 gallons 



Flowers of sulphur 

 usually cost a little 

 more than the sulphur 

 flour, but should be 

 preferred when the so- 

 lution is to be cooked 

 over a fire in a kettle. 

 When the solution can 

 be cooked with live 

 steam, which is the bet- 

 ter way, the cheaper 

 grades of sulphur are 

 equally available. 



Begin by slaking the 

 lime in a small amount 

 of water in a large iron 

 kettle. Whe-n the slak- 

 ing lime generates a 

 considerable amount of 

 heat, sprinkle the sul- 

 phur in gradually, thus utilizing the heat of 

 the lime in cooking the sulphur. At this stage, a 

 fire should be made under the kettle and the solu- 

 tion kept up to the boiling point, adding the water a 

 little at a time. Vigorous boiling should be main- 

 tained for about an hour, at the end of which time 

 the solution becomes a dark orange in color and 

 should have very little sediment at the bottom. 

 Whether it shows sediment or not, the solution 



FIG. 41 

 BOILING LIME-SULPHUR 



