430 Reporr or THE DEPARTMENT OF KNTOMOLOGY OF THE 
MATERIALS, 
The forms of sulphur which are adapted for concentrated 
Solutions are flowers of sulphur, and light and heavy sulphur 
flour. These can be obtained from the wholesale druggist hand- 
ling spraying supplies. The lime should be fresh lump lime, 
free from dirt and grit. It should test not less than 90 per ct. 
calcium and should contain not more than five per ct. of mag- 
nesium oxide, 
COOKING THE WASH. | 
Slake the lime, which should be of a consistency of thin paste, 
and add the sulphur. Stir the materials thoroughly during 
the cooking process in order to break up the coarse lumps of 
sulphur. Boil the wash vigorously for one hour, in which time 
the sulphur should be completely dissolved. In starting the 
wash to cook, a sufficient quantity of water should be used to 
provide for shrinkage so that there will be fifty gallons of mix- 
ture at the completion of the boiling. With kettles an allow- 
ance of ten or fifteen gallons may be required while an outfit 
using direct steam will usually not need additional water. A 
few boilings should indicate the quantities of water needed to 
make approximately the amount of concentrate given in the 
formula. In using barrels or kettles of fifty gallons capacity, 
it is advisable to make one-half of the mixture provided by the 
formula, to avoid losses by the boiling over of the materials. 
BARRELING THE CONCENTRATED SOLUTION. 
If the concentrate is not for immediate use, it should be 
stored in tight containers. After boiling is completed, strain 
the mixture into a barrel, which should then be corked. A 
sample of the clear solution should be tested by the hydro- 
meter, and the reading marked on the container, to indicate 
the required dilution for future use. The coarse particles of 
sulphur in the residue may be cooked up in later boilings. 
STORAGE OF LIME-SULPHUR SOLUTION. 
Lime-sulphur solutions may safely be stored if they are not 
subjected to very low temperatures. In general one should 
avoid prolonged storage and prepare the mixtures just preced- 
