on Alcohol at common Temperatures. 43 



phurous acid, burns, and is converted into white sulphate of 

 baryta. 



The analysis of this compound gave the following results : — 



I. 0'787 grm., burnt with chromate of lead, gave 0'177 grm. 

 carbonic acid and 0*160 grm. water. 



0379 grm., dissolved in water and precipitated with sulphuric 

 acid, gave 0*219 grm. of sulphate of baryta. 



0*340 grm., oxidized with a mixture of chlorate of potash and 

 hydrochloric acid, and the sulphuric acid precipitated by chloride 

 of barium, gave 0*390 grm. of sulphate of baryta. 



II. 0*705 gi'm., burnt with chromate of lead, gave 0*158 grm. 

 carbonic acid and 0*139 grm. water. 



0*432 grm., burnt in a crucible, moistened with sulphuric 

 acid, left, after the excess of the latter had been expelled by ap- 

 plication of heat, 0*250 grm. of sulphate of baryta. 



The substance employed was dried in vacuo, and according to 

 the above determinations, contains in 100 parts, — 



I. II. 



Carbon 6*13 611 



Hydrogen 2*25 2*19 



Barium 33*77 33*98 



Oxygen . 



Sulphurous acid . . . 31*53 



The formula 2(C^H^Ba2 03, 2S02) + 7H20 requires,— 



Carbon .... 4 48 5*97 



Hydrogen ... 18 18 2*25 



Barium .... 4 274 34*07 



Oxygen .... 13 208 25*87 



Sulphurous acid . . 4 256 31*84 



804 100*00 

 Glyoxal,C''B.''0^. 

 The compound of glyoxal with bisulphite of baryta is dissolved 

 in boiling water, and to this solution diluted sulphuric acid added 

 as long as a precipitate of sulphate of baryta is produced. The 

 filtrate from the latter contains sulphurous acid and glyoxal, — 

 C^H^Ba^O^, 2S02 + HH0, S03=C2H4 03 + Ba20 803 + 280^. 



Glyoxal. Sulphate of 

 baryta. 



On evaporating at first on the water-bath and afterwards in 

 vacuo, or in a stream of carbonic acid, the sulphurous acid and 

 water go off, and the glyoxal remains as an amor])hous, trans- 

 parent, and nearly colourless substance. It absorbs moisture 

 very readily from the air, and dissolves in water, alcohol, and 

 {cthcr. The aqueous solution precipitates acetate of lead very 



