B. H. Chittenden— Oxidation product oj Glycogen. 397 



salt can be filtered off from the excess of calcium carbonate. 

 If the solution is at all colored it can be purified by animal 

 charcoal. When suitably concentrated, this solution on standing 

 several days, changes into a mass of irregular white globules, 

 which are aggregations of fine microscopic needles. 



The air-dried salt, when heated to 100° C. loses only hygro- 

 scopic water, and, when heated above 100° C. turns brown, 

 which would indicate decomposition. The salt after crystalli- 

 zation is difficultly soluble in cold water ; readily soluble in hot 

 water, and is precipitated from its aqueous solution by alcohol. 

 The analysis of the salt gave the formula: CgH, ,Ca'0,. 

 I. 0-2097 grams of the salt dried at 100° C. gave -2552 grams 



CO2 and -1015 grams HgO. 

 II. 0-317 grams of the dried salt gave '3851 grams COg and 

 ■1508 grams HgO. 

 ni. 0-3305 grams of the dried salt gave -0429 grams CaO. 

 IV. 0-272 grams of the dried salt gave -036 grams CaO. 



... 1 of the £ 



bath \ 



a soluble barium salt of the acid results. The salt thus formed 

 does not crystallize readily from this solution. Alcohol is then 

 added in excess to the fluid, when a heavy white precipitate 

 forms, flocculent at first, but soon becoming gummy. This 

 precipitate is washed with alcohol, and after drying has the 

 appearance of a hard yellow gum. The gum-like mass is dis- 

 solved in water, filtered through animal charcoal, and evaporated 

 to a small bulk, when, after standing a week, the fluid is con- 

 verted into a mass of quite large, white, glassy prisms, which 



The analysis of the salt dried at 100° C. gave the formula : 

 C«H,,Ba'0,. The air-dried salt gave the formula: C^H.^Ba' 

 0,-fl^H,0. 



I. 0-347 grams of the salt dried at 100° C. gave -3488 grams 



CO2 and -1402 grams H3O. 

 II. 0-2778 grams of the dried salt gave -2793 grams COg and 

 '1102 grams HgO. 

 m. 0-498 grams of the dried salt gave -1872 grams BaCOa. 

 IV. 0-3117 grams of dried salt gave -1175 grams BaCOg. 

 V. 1-2257 grams of the air-dried salt gave by drying at 100° C. 

 •11542 grams H2O. 



