PROCEEDINGS OF SECTION B. 95 



study, as much material of this class now goes to waste. I am informed, 

 however, that barks containing kinos of this class have lately come 

 into use to some extent in the manufacture of a leather substitute. 

 It seems reasonable to expect that other uses for eucalyptus kinos will 

 eventually suggest themselves, and the economic possibilities of the 

 products of this wonderful group of trees thus be further extended. 



3.— THE ACTION OF HYDROGEN PEROXIDE ON BARIUM 



CYANATB.* 



By Ruth Sugden, M.Sc. 



(Abstract.) 



The action of hydrogen peroxide on aqueous solution of barium 

 cyanate has been examined to ascertain whether there is formation of 

 specific oxidation products such as LidofE has recently claimed, namely, 

 the salt, BaCN02 and the gas CNO, or whether the action is, as previously 

 claimed by Masson, simply accelerated hydrolysis of the cyanate to 

 carbonate and carbamide, together with lilDeration of oxygen from the 

 peroxide-. The results are in accordance with the latter view and 

 afford no support to the hypothesis of the existence of the compounds 

 formulated above. 



The precipitated salt could not be distinguished from barium 

 carbonate, and the gas evolved was shown to be a mixture of oxygen 

 and nitrogen. The formation of the latter is explained by the fact 

 that nitrogen is liberated by the action of hydrogen peroxide on car- 

 bamide, which is an essential product of the hydrolysis of cyanates. 



4.— ACID ANHYDRIDES : HYDRATION AND OTHER 



CONSTANTS. 



By Stella Deakin Rivett, B.Sc. 



(Abstract.) 



Investigations on the dynamics of the hydration of acid anhydrides 

 have been carried out by Menschutkin and Vasilieff (J. Russ phys. 



* Published in full in Journ. Chem. Soc, 1913. 



