4 ART. in. — T. HAGA : 



obtained was purified and weighed, and from its weight the 

 amount of the sulphate sulphur was calculated to be 96.3 per cent 

 of the quantity calculated on the theory, that one molecule of 

 sulphuric acid is formed along with one molecule of the- imide. 



From this experiment it has become clear, that the low 

 yields of dibenzenesulphimide were not due to the presence of 

 alcohol in the reacting mixture. Experiments were then made, in 

 which an alcoholic solution of dibenzenesulphohydroxylamine was 

 treated with a rapid current of sulphur dioxide, until the solution 

 was nearly saturated with it, and then left closed for forty eight 

 hours in an atmosphere of sulphur dioxide. Contact with the 

 atmospheric air was avoided by replacing it with carbon dioxide 

 before the treatment with sulphur dioxide. The results showed 

 that in this manner, a more nearly theoretical yield of dibenzene- 

 sulphimide can be obtained. The actual yields of dibenzene- 

 sulphimide, in the form of its barium salt, were 91.9 and 97.7 

 per cent of the theoretical amount. The yield would, probably, 

 have been the full theoretical quantity, if it had been determined 

 as the less soluble mercury dibenzenesulphimide. 



Suljyhates formed by the Beaction between Dibenzenesidpho- 

 hydroxylamine and Sulphur Dioxide : — As was to be expected, a 

 quantity of sulphuric acid is always produced along with dibenzene- 

 sulphimide, but when alcohol was used as the medium of the 

 reaction, its quantity was found to be much less than that corres- 

 ponding to equation (1), given on p. 2, only 31.4 and 32.9 per 

 cent of the theoretical quantity having been found even when no 

 precaution was taken to prevent the oxidation of sulphur dioxide 

 by the air and as little as 20.05 per cent when special arrange- 

 ments were made to avoid the oxidation of sulphur dioxide. The 



