Lime-Sulfur 53 



38 grams should be used, if 90 per cent lime 

 40 grams. Lime that is over 10 per cent 

 magnesium oxid should not be used as 

 it is a waste of material. The magnesium 

 forms insoluble compounds that go into the 

 sediment. In case the lime is already slaked 

 increase the quantity in the ratio of the 

 weights of CaO : Ca02H2 (i.e., 56 : 74). 



It is an easy matter to select lime that 

 carries less than 2 per cent of magnesia as the 

 analysis is on the barrel and the product of a 

 given '.ime-kiln is fairly constant in compo- 

 sition. 



If all the material is not in very finely 

 divided condition it will remain as sediment 

 and not react; hence the sulfur is moistend 

 to prevent lumping. 



If a beaker is used place a piece of asbestos 

 under it, otherwise the solid material will 

 form a blanket over the bottom of the beaker 

 and prevent the diffusion of the heat. The 

 glass will not stand sudden local heating and 

 cooling resulting from such blanketing. 



The reactions w^hich take place when the 

 material is being made, according to Pro- 

 fessor Tartar at the Oregon Agricultural Ex- 

 periment Station, are, first, the action of lime 

 and sulfur to form calcium tetrasulfid, and 

 calciima thiosulfate, 



3Ca02H2 + lOS = 2CaS4 + CaS203 + 3H2O. 



