8 ART. lo. — T. HAGA : 



pliiite (ScHABüS, quoted in Beilstein's Handbuch from Jahresber., 



1854, 560 ; Marignac, quoted in the same work from Jahresber., 



1855, 608). The salt, after hydrolysis at loO°C., gave an abundant 

 iodoform reaction. The free acid was prepared from slightly 

 impure barium salt, and found to be a syrupy liquid, which 

 refused to crystallise in the desiccator. 



Benzenesulphonic Acid amowj the Products of the Aclion 

 of Sulphur Dioxide upon Diôenzenesulphohydroxy lamine. — As may 

 be inferred from what has been stated above, only a portion of 

 the sulphur in the products of the action of sulphur dioxide upon 

 dibenzenesulphohydroxylamine can be converted by hydrolysis into 

 sulphuric acid, the other portion refusing to undergo hydrolysis 

 and being converted into a sulphate only by fusion with potas- 

 sium hydroxide and nitre. That this is due to the presence of 

 benzenesulphonic acid was proved by isolating the acid in the 

 form of its barium salt. For this purpose, forty grammes of di- 

 benzenesulphohydroxylamine were dissolved in two hundred and 

 thirty cubic centimetres of about ninety per cent alcohol and 

 treated with a current of sulphur dioxide, without any special 

 precaution being taken to avoid contact with air, until the increase 

 in weight was about thirty two grammes. After the mixture had 

 stood for several days in a stoppered bottle, the excess of sulphur 

 dioxide was expelled by a current of air. The liquid was then 

 neutralised with barium hydroxide and evaporated on a water 

 bath. After the removal, by crystallisation, of the sparingly soluble 

 barium dibenzenesulphimide a quantity of a barium salt was obtain- 

 ed in the crystalline state. This was purified by recrystallisation, 

 and was then found to be quite free from nitrogen. On analysis it 

 gave 29.07 per cent of barium and 14.34 per cent of sulphur. The 

 calculation for barium benzenesulphonate requires 30.43 per cent 



