72 INSECTICIDES FOR SUCKING INSECTS 



Place in the main boiler 50 pounds of stone lime. Add 20 gallons 

 of hot water. While the lime is slaking add 100 pounds of sulphur. 

 Stir the mixture thoroughly and constantly, adding more water from 

 time to time. When the lime is slaked, add hot water to make 70 

 gallons. Boil this slowly for one half to three quarters of an hour, or 

 until all of the sulphur and lime are dissolved. Dip out small quanti- 

 ties and test from time to time. As the material boils away, add hot 

 water to keep the volume up to 70 gallons. When the materials are 

 all dissolved, pour out into barrels, straining carefully, and allow to 

 cool. At once close up as nearly air tight as possible. 



To dilute for use as a winter spray, take 1 gallon of the concentrate 

 to 5 gallons of water. Or, better, have a Baume hydrometer, test 

 the specific gravity of the concentrate, and dilute with water according 

 to the following table : 



Reading on Hydrometer in Degrees Number of Gallons of Water to 



Baume One Gallon of the Concentrate 



35 9 



34 8f 



33 8i 



32 8 



31 7^ 



30 7i 



29 6f 



28 6i 



27 6 



26 5f 



25 5i 



24 5 



23 4i 



22 4i 



21 3f 



20 3i 



19 3i 



18 3 



17 2f 



16 2i 



15 2i 



14 2 



The above dilutions are for winter strength (the material commonly 

 used for San Jose scale and leaf blister mite). 



