456 MR. G. B. BUCKTON AND DR. A. W. HOFMANN’S RESEARCHES ON THE 
a filtered sample ceases to give an insoluble precipitate with chloride of barium. The 
liquid thus obtained contains now in solution chiefly two ammonium-salts, one of 
which is scarcely crystallizable, whilst the other forms large and regular rhombic 
crystals, sometimes of an inch diameter. In addition to these ammonium-salts, a cer- 
tain quantity of barium- and even calcium-salts are present which it is necessary to 
decompose by carbonate of ammonium in excess before an attempt is made to effect 
a separation of the two salts. 
On adding a saturated solution of either chloride or acetate of barium to a mode- 
rately strong solution of the crystallized ammonium-salt, the liquid becomes, in the 
course of a few minutes, nearly solid from the deposition of a mass of crystals of a 
barium-compound which may be collected on a filter and well washed with cold 
water from the chloride of ammonium and excess of the precipitant. 
One recrystallization from boiling water furnishes this salt in a state of purity. It 
in no manner differs from the barium-salt previously described as procured from 
acetonitrile. The identity is moreover proved by the following analytical results : — ' 
Analysis of the barium-salt resulting from the action of sulphuric acid upon aceto- 
nitrile and acetamide. 
I. 0'7526grm. of substance, dried at 190°, gave 0'-5678 grm. of sulphate of harium, 
II. 0‘5998grm.of substance, dried at 190°, gave 0’4516 grm. of sulphate of barium. 
III. 0'6318 grm. of substance, dried at 170°, gave 0*4708 grm. of sulphate of harium. 
IV. 0*6383 grm. of substance, dried at 180°, gave 0*4753 grm, of sulphate of barium. 
V. 0*5918 grm. of substance, burnt with chromate of lead in a current of oxygen, 
gave 0*0247 grm. of water and 0*0820 grm. of carbonic acid. 
VI. 0*7644 grm. of substance, burnt with chromate of lead in oxygen, gave 
0*0440 grm. of water and 0*0975 grm, of carbonic acid. 
VII. 0*7612 grm. of substance, burnt with chromate of lead in oxygen, gave 
0*0472 grm. of water and 0*0990 grm. of carbonic acid. 
VIII. 0*3272 grm. of substance, burnt with chromate of lead in oxygen, gave 
0*0224 grm. of water and 0*0502 grm. of carbonic acid. 
IX. 0*4638 grm. of substance, ignited with chlorate of potassium, gave 0*7038 grm. 
of sulphate of barium. 
Experiments I., II., V. and IX. refer to salts prepared from acetonitrile, the re- 
mainder to preparations from acetamide. 
Percentage composition. 
( ^ 
I. II. III. IV. V. VI. VII. VIII. IX. 
Barium . 44*36 44*26 43*81 43*78 
Carbon. . 3*60 3*52 3*54 4*18 
Hydrogen. 0*46 0*62 0*68 0*76 
Sulphur 
20*83 
