NITRILOSULPHAÏES. 9 



gradually to a crude solution of sodium nitrilosulphate (p. 5). 

 We have obtained the same salt, which is like the sodium salt in 

 appearance and like the potassium salt in being nearly insoluble. 

 According to Raschig it is anhydrous and occurs either as a spark- 

 ling sand or in hard crystals, the size of pinheads and of adaman- 

 tine lustre. 



Barium salts. — By dissolving the sodium salt in a strong 

 solution of barium chloride faintly alkaline with ammonia, a 

 flocculent precipitate is obtained which becomes dense and crys- 

 talline on standing. It is sparingly soluble in water and very 

 unstable. It probably contains sodium but we have not analysed 

 it. Fremy obtained barium ammonium and barium potassium 

 salts which he could only imperfectly analyse because of their 

 instability. They resembled the barium sodium salt, and from 

 the results of his analyses appear to have been two-thirds barium 

 and one-third ammonium or potassium salt, with water of crys- 

 tallisation. 



Lead sails. — According to Fremy, very unstable lead salts 

 containing potassium or ammonium are obtainable. 



