THE IMIDES OF THE AROMATIC SCLPHONIC ACIDS. / 



corresponding to the total quantity of mercury dibenzenesulpli- 

 imide found, viz. 60.14 grammes, is 422 c.c, or, say, 4.4 

 grammes of real alcohol. If the formation of one molecule 

 of dibenzenesulphimide had been accompanied by that of 

 one molecule of ethylsulphuric acid, then 60.14 grammes of 

 mercury dibenzenesulphimide would correspond to 4.866 

 grammes of sulphur in the form of ethylsulphuric acid ; but in 

 this experiment, 1.36 grammes of sulphur was found in a 

 form directly procipitable by barium chloride. The difference, 

 namely 3.506 grammes, represents the sulphur of ethysulphuric 

 acid, corresponding to 5.036 grammes of alcohol, which quantity 

 is in sufficient agreement with that above found. If, in the 

 same experiment, the portion of sulphur, which became precipitable 

 by barium chloride after hydrolysis at 150°C., namely 3.069 

 grammes experimentally found, was taken as that of ethylsul- 

 phuric acid, then 4.408 grammes of alcohol ought to have been 

 formed, a result, which agrees still better with tlie (piantity 

 found. It was, however, not possible to isolate the ethylsulphuric 

 acid in a form fit for analysis. Attempts to obtain the salts of 

 ethylsulphuric acid in the pure state were only partially successful. 

 The barium, lead, copper, and silver salts were prepared 

 and found to have the properties of the corresponding ethyl- 

 sulphates, but they could not be obtained pure enough for 

 analysis. Only the potassium salt could be obtained pure. It 

 formed non-deliquescent thin prismatic crystals, quite free from 

 nitrogen, and containing 19.34 per cent of sulphur, while the 

 calculation requires 19.52 per cent. Its solubility in water agreed 

 sufficiently well with that of potassium ethylsulphate. One part 

 of water at LSi^C. dissolved 1.14 parts of the salt, while one 

 part of water at 17°C. dissolves 1.25 parts of potassium ethylsul- 



