540 



ADDENDUM 



should be kept well stirred, especially during the early stages of the 

 process. The boiling should continue until the sulfur granules are evi- 

 dently dissolved, generally 40 to 60 minutes. Pour or strain the clear 

 liquid into a barrel or other storage vessel that can be completely^ filled 

 or corked, and cut off air contact with a t^in layer of paraffin oil, or 

 any other heavy oil, to prevent formation of crystals. 



To test the concentration of the commercial and the home-made solu- 

 tions, secure a Beaume hydrometer at the drug store, with a range of 

 25 to 35 degrees. In testing the solution, pour some of the clear red- 

 dish liquid into any deep receptacle, deeper than the hydrometer is 

 long, and when full gently drop the instrument into the solution and 

 wait until it comes to rest. Then read on the hydrometer the degree 

 of concentration, which will be the one just at the surface of the liquid. 

 When the degree of concentration of the solution is known, the proper 

 dilution may be obtained by referring to the following figures : 



The usual or average strength of these concentrated lime-sulfurs is 

 about 32° ; for dormant trees, a 1-10 dilution is usual, and for trees 



