150 Proceedings of the Royal Society of Victoria. 



Loss OF Weight expressed in Percentage. 



Solvent — -25 per cent. Potassium Cyanide Solution — Stationary. 



It would thus appear that the most effective cyanide solution 

 (proved by Maclaurin to be a -25 %) is not so rapid in action as 

 the chlorine solution usually worked with in practice, but it 

 must be borne in mind that the chlorine solution (-4 %) is twice 

 as strong as the cyanide solutions generally used. I should also 

 have mentioned that during the progress of the experiments it 

 was noticed that wherever the strips touched the containing 

 vessels they were not attacked so much at tliose points. This 

 will account for small irregularites observed. 



Table Showing the Solubility of Gold Silver Alloys. 



Solvent — Saturated Solution of Chlorine "Watek. 



Weight 

 after 

 90 hrs. 



1-020 

 1-714 

 1-410 

 l-.'-.85 

 1-416 

 1-1.56 



.50-64 

 85-10 

 69-11 

 78-34 

 GO -05 

 59-G6 



Each strip of gold was immersed in 50 cc. of water, through 

 which a continuous stream of chlorine was allowed to pass. 



