PROCEEDINGS 



OF 



THE ROYAL IRISH ACADEMY. 



1838. No. 18. 



June 11. 



SIR Wm. R. HAMILTON, A. M., President, in the Chair. 



Godfrey Levinge, Esq., John H. Lecky, Esq., William 

 Brenuan, Esq., and David Aher, Esq., were elected Mem- 

 bers of the Academy. 



Dr. Kane read a notice " On the Action of Arseniu- 

 retted Hydrogen on Sulphate of Copper, and on the Manga- 

 nese Alum analysed by Dr. Apjohn." 



The author stated, that on passing dry arseniuret of hy- 

 drogen over dry sulphate of copper, it is absorbed with the 

 evolution of considerable heat; much water is evolved, and 

 a black mass is formed, which consists of sulphuric acid, 

 arsenic, and copper : the whole of the oxygen of the oxide 

 of copper being removed with the whole of the hydrogen of 

 the arseniuret of hydrogen. The re-action is 



3 (so 3 + cu o) (3so 3 + as? ci/ 3 ) 



+ = + 



(a* 2 + H 3 ) 3 (ho). 



The formation of this body, appears to Dr. Kane to render 



probable the idea that a quantity of arsenic equal to one- 



75 4 

 third of the double equivalent, — ^- = 25,\3, combining with 



o 



metals may form compounds similar to oxides, and thus the 

 body just noticed be a sulphate of that arseniuret of copper, 



T 



