La rèaction de parri et les sulfonamides

In der Parri's reaction certain sulphonamidcs give colourations which may lead to confusion with barbiturates. Sulphathiazole gives an intense violet colour; sulpliapyndine and sulphadiazinc give a weak violet colour.In the case of sulphathiazolc the colour is due to its coball(II) salt. In the presence of an excess of ammonia there is formed an insoluble rose-coloured product corresponding to the formula (Sulphathiazole) ₂Co(NH₃).3H₂O.     

Sur la thermogravimétrie des précipités analytiques : Dosage du sodium

This thermogravimetric study has enabled the authors to specify a large number of points of detail in connection with the correct determination of sodium. Their attention has been particularly directed to the triple acetates, which they recommend should be weighed only in the form of pyro-uranates. The method of ball, less classical than the others, would merit greater attention on the part of analysts.