316 PROCEEDINGS OF SECTION B. 



2.— WET TREATMENT FOR COPPER AND GOLD 



IN AUSTRALIA. 



B>/ GEORGE SUTHERLAND, M.A. 



[Synopsis.] 

 This paper calls attention to the special applicabilit)' of the 

 method of extracting copper from its ores by the use of the 

 protochloride of iron in the cases of Australian mines which are 

 situated at great distances from the seaboard. Passing on to the 

 consideration of the cupric salts it, cites their successful api)lication 

 to the jnirpose of the economical production of chlorine from 

 hydrochloric acid, and suggests that chlorination for the extraction 

 of gold might be rendered less costly than it now is if copper salts 

 were utilised in this way. Finally, it discusses the reported 

 successful combination of wet treatment and amalgamation for 

 gold, by which it is claimed that, with the use of a current of 

 electricity, gold may be extracted without coming into actual 

 contact with the mercury. 



o-i^-o 



3.— ON OSMOTIC PRESSURE. 



By Professor 0R3IE MASSOX, M.A., D.Sc. 

 (Withdrawn.) 



4.— THE EXPERIMENTAL INVESTIGATION OF 

 OSMOTIC PRESSURE. 



By Professor ORME JIASSOX, M.A., E.Sc, and J. B. KIRKLAXB. 



(Withdrawn.) 



o-»J<-o 



5.— ON HYPONITRITES. 



By B. H. JACKSON, M.A., B.Sc. 

 [Communicated by Professor Orme Masson, M.A., D.Sc] 

 Since the hyponitrites were discovered by Dr. Divers in 1871 

 (Proc. Roy. Soc. xix., 4'25) a considerable number of investiga- 

 tions have been made on this subject, but in none of the papers 

 published, with one exception (Menke, C.S.J., 33, 401), is there 

 any account of the isolation of the alkaline hyponitrites. • 



