11 



In ordering our chemicals therefore we reckon upon 

 20 lbs. of lime and 15 lbs. of sulfur for every 50 gallons 

 of spraying solution which we have estimated to be need- 

 ed. Emphasis should be laid upon the ultimate economy 

 of using only the best and purest chemicals obtainable, 

 regardless of their slightly greater initial cost. 



Lime. — This means always freshly burned rock lime 

 or quick lime. The test of quality is the slaking. Good 

 limes should not contain more than ten per cent of impuri- 

 ties. Poor limes may contain 25 per cent of impurities. 

 It is partly on account of these varying percentages of 

 impurities that more lime than sulfur is used in the for- 

 mula given. A good lime will slake readily and form an 

 even creamy solution with little sediment or coarse matter 

 which is waste. 



Much first-class lime is produced in Alabama, partic- 

 ularly that made in the vicinity of Calera. The addresses 

 of several manufacturers may be found in the Appendix 

 on page S'O, 



The best grade of lime is shipped and handled in bar- 

 rels. This is the best form in which to buy it, and the cost 

 should not exceed about $1.00 per barrel or Ic per pound 

 for our spray formula. In nearly every town may be 

 found someone who handles a good grade of lime. 



Sulfur. — The sulfur used must be very finely pow- 

 dered to combine readily and completely with the lime in 

 the making of the wash. Two forms of sulfur to be found 

 on the market are perfectly pure and answer this need 

 equally well. The "Flowers of Sulfur" is the finest form 

 and is largely used, but may cost slightly more than does 

 "Sulfur Flour" or "Flour Sulfur" as it is called. The 

 choice between these two depends upon availability and 

 price. Either should be obtainable at about five cents per 

 pound in lots of fifteen pounds or more. If not obtaina- 

 ble at a satisfactory price through local druggists, sulfur 

 may be secured through the wholesale drug firms listed 

 in the Appendix page 20, and from other firms probably 

 as well. Crystalline Sulfur should not be used under any 



