I (J Q E D W ARD DIVERS AN D TAMEM AS A HAG A : 



and Amidosulphoriatcs. A perusal of these led us to resume work on 

 the subject with the intention only of examining into the differences 

 between his results and ours, but we went further afield and prepared 

 a few new salts, because they promised to be of interest. 



For convenience of reference, we follow in this paper the order of 

 description observed in the former paper and reproduce, as briefly as 

 possible, m:itters of interest in Berglund's paper in Swedish not to be 

 found in chemical literature outside it. A full list of the salts prepared 

 by him is given by Watts (op. cit.) 



Berglund's first source of imidosulphonates was ammonia and 

 chlorosul phonic acid, but afterwards he had resort to potassium nitrite 

 and sulphite, following Fremy, with modifications which do not call 

 for notice here. 



Alkali imidosulphonates. 



Ammonium imidosulphonates — Berglund failed to get normal am- 

 monium imidosulphonate ; the statement in Watts' Dictionary that he 

 did get it is therefore erroneous. He believed Rose's ' vitreous 

 sulphiitammon ' to be this salt, but our own experience has convinced 

 us that this substance, before as well as after its crystallisation from 

 water, is the two-thirds normal imidosulphonate, and that Rose's 

 ' flocculent sulphatammon,' not noticed by Berglund, is indeed an- 

 hydrous normal ammonium imidosulphonate. To AVoronin is due 

 the accurate distinction between the two salts. 



The mother- liquor of the crystals of the two-thirds normal am- 

 monium imidosulphonate (' parasulphatammon ') gave Rose on 

 evaporation his so-called 'deliquescent salt.' This Berglund con- 

 sidered, it appears from his later paper on Amidosulpho?iic acid, to 

 have been a mixture of amidosulphonate and the two-thirds normal 

 imidosulphonate with ammonium acid sulphate. 



