Amidosulphonic acid. 



by 



Edward Divers, M. D., F. R. S., Prof. 



and 



Tamemasa Haga, F.C.S., Rigakuhakushi, lale Asst. Prof. 



College of Science, Imperial University. 



Amidosulphonic acid, erroneously supposed to be known nearly 

 forty years ago, was not actually discovered and prepared by Berglund 

 until 1876, and has only attracted the attention of chemists to any 

 extent since 1887, when Raschig made known an easy process for its 

 preparation in a new way. 



The contents of this paper are a summary, not elsewhere found, 

 of the work of others ; new ways of forming the acid ; a study of the 

 interaction of oxyamidosulphonic acid and sodium amalgam, and of 

 the same acid and sulphur dioxide ; improvements of known methods 

 of preparing amidosulphonic acid ; a very productive and economical 

 method of preparing it ; undescribed properties of it ; some new salts 

 of it ; remarkable points in the behaviour of its silver salt and mercury 

 salt; and an investigation of the decomposition of the acid and its 

 salts by heat. 



Our colleagues, Professors Sakurai, Loew, and Takahashi have 

 helped us in adding to what was known of the acid, by investigating, 

 the first-named, its molecular conductivity, the other two, its phy- 

 siological action. Doth these investigations have a special interest, and 

 form the subjects of separate communications following this. 



