JOURNAL OP THE COLLEGE OP SCIENCE, IMPERIAL UNIVERSITY, 



TOKYO, JAPAN, 



VOL. XIX., ARTICLE 16. 



Peroxylaminesulphonic Acid. 

 By 



Edward Divers, M. D., D. Se, F. B. S. 

 Emeritus Professor of Chemistry, Imperial University of Tokyo. 



Although unrecorded in works on chemistry or chemical tech- 

 nology, it has long been known to inspectors and workers of the 

 lead-chamber process for manufacturing sulphuric acid, that when, 

 through improper working of the chambers, sulphur dioxide is 

 allowed to pass into the Gray-Lussac tower, it produces witli the 

 nitrososulphuric acid, also present in the tower, what is called " purple 

 acid," together with an effervescence due to the escape of nitric oxide 

 (Carpenter and Linder, J. Soc.Chem. Ind., 1902, 21. L492). Sabatier 

 has shown (Compt. rend., 1896, 122, 1417, 1479, and 15:17; 123, 255) 

 how to give an intensely bluish- violet colour, evidently the same as 

 that of " purple acid," to the monohydrate of sulphuric acid holding 

 nitrososulphuric acid in solution, either by passing sulphur dioxide 

 into it, or by mixing it with sulphuric acid of similar strength con- 

 taining dissolved sulphur dioxide. Such u sulphuric acid solution of 

 sulphur dioxide may also be treated for some time with a current of 

 nitric oxide and air ; or, excluding air, the nitric oxide alone will 

 produce the colour, when a very small quantity of either copper 



