SYNTHETICAL EESEAECHES ON ACIDS OF THE LACTIC SEEIES. 317 



dissolves, even in the cold ; on heating the solution in a water-bath, a liquid having the 

 properties of alcohol distils off; and on separating the excess of baryta by carbonic acid 

 and filtration, the solution yields on evaporation a crystallizable barium-salt, which after 

 drying at 100° C, gave on analysis the following numbers: — 



I. -3510 grm., burnt with plumbic chromate, gave -4613 grm. carbonic anhydride 

 and *1873 grm. water. 



II. -3490 grm. gave -4580 grm. carbonic anhydride and -1842 grm. water. 

 III. -4545 grm., dissolved in water and precipitated with sulphuric acid, gave -2618 

 grm. baric sulphate. 



These results agree closely with the formula of baric diethoxalate, as shown in the 

 following comparison : — 



fCEtaHo 



^^^^Ba" 



rcoo • 



■ IcEt^Ho 



Calculated. Found. 



I. II. III. Mean. 



35-82 35-79 35-81 



5-88 5-86 5-87 



33-87 33-87 



24-45 



100-00 



Baric diethoxalate is very soluble, even in cold water ; when its boiling solution is 

 precipitated with excess of dilute sulphuric acid and the baric sulphate removed by fil- 

 tration, ether readily extracts diethoxalic acid from the cooled filtrate. On evaporating 

 the ethereal solution, the acid crystallizes in splendid prisms, which, after drying in vacuo, 

 gave the following analytical results : — 



I. -3265 grm. gave -6510 grm. carbonic anhydride and -2720 grm. water. 

 II. -2510 grm. gave -5006 grm. carbonic anhydride and -2083 grm. water. 



These numbers correspond well with those calculated from the formula 



