362 Messrs. Wanklyn and Cooper on the 



At 160° C. to 170° C. the salt loses one atom of water, be- 

 coming (C 4 H 4 Ba N0 2 ) 2 2H 2 0, but regains the water on ex- 

 posure to the atmosphere at ordinary temperatures and under 

 ordinary conditions. 



It is very soluble in water, and only sparingly soluble in 

 40-per-cent. alcohol, the degree of solubility being about 

 one part of the salt in one hundred parts of the alcohol of that 

 strength. 



There is a basic baryta-salt, which is obtained by adding 

 baryta- water to the solution of the neutral salt and then preci- 

 pitating by the addition of an equal volume of 84-per-cent. 

 alcohol. The salt forms a white precipitate, which after dry- 

 ing at 115° C. contained 42*84 per cent, of barium. The 

 theory for (C 4 H 4 BaN0 2 ) 2 , BaHO, 3H 2 requires barium 

 43*50 per cent. 



Cyano-propionate of Silver. — This salt is insoluble, or spa- 

 ringly soluble in water. It was obtained by precipitating an 

 aqueous solution of the baryta-salt by means of nitrate of silver, 

 and formed a curdy white precipitate, which was washed, 

 pressed between bibulous paper, and finally dried at 100° 0. 

 The dried salt was analyzed as follows : — 



I. 0*397 grm., burnt with oxide of copper, copper-turnings, 

 and a final stream of oxygen, gave 0*092 grm. of water and 

 0*333 grm. of carbonic acid. 



II. 1*180 grm., burnt only for water, gave 0*245 grm. of 

 water. 



III. 0*480 grm. gave, on ignition, 0*246 grm, of silver. 



(0 4 H 4 NAg0 2 ) 2 KH 2 0). FoumL 



Calculated. 



I. II. III. 



C 8 96 22*80 22*88 — — 



H 9 9 2*14 — 2*31 



~N 2 28 6*65 — — 



Ag 2 216 51*31 — — 51*25 



4i _72 17*10 — — — 



421 100*00 



The dry silver-salt was very hygroscopic, and absorbed 2 

 per cent, of water very rapidly on exposure to the air. 



Apparently a basic silver-salt exists, and is obtained when 

 basic baryta-salt is precipitated with nitrate of silver. Such 

 a salt, dried in the water-bath, has given the following results 

 on analysis : — 



