400 R H. Chittenden— Oxidation product of Glycogen. 



Lead Salt. — On treating an aqueous solution of the calcium 

 salt with basic lead acetate, best with the application of heat, a 

 heavy white gelatinous precipitate is obtained, which after 

 washing with hot water and drying at 100° C, yielded by analysis 

 the formula: C,H,Pb,0,. 



L 0-280 grams of the salt dried at 100° C. gave -115 grams 



CO, and -0358 grams H^O. 

 II. 0-3855 grams of the dried salt gave -1645 grams COg and 

 •0505 grams HgO, 



III. 0-436 grams of the dried salt gave -3212 grams PbO. 



IV. 0-1522 grams of the dried salt gave -1122 grams PbO. 



similar precipitate is obtained with basic lead 



precipitates, after washing with water and drying at 100° C, 



gave by analysis the following results : 



Precipitate produced by Precipitate produced by 



11-60 C 11-42 



H 1-42 H 1-55 



Pb 68] 9 Pb 68-66 



O 18-79 O 18-37 



A silver salt was also obtained as a flocculent precipitate. 

 This was not analyzed. 



By a backward glance we see that in all the salts obtained, 

 with the exception of the lead salt, the acid acts as a monobasic 

 acid. In the case of the lead salt, 'however, four atoms of hy- 

 drogen are replaced by two atoms of the metal. Hlasiwetz in an 

 article upon the basicity of "lactonsaure " and " gluconsiiure,"* 

 in which he shows that these acids are not only monobasic but 

 also dibasic, gives a method whereby he obtained a dibasic 

 barium salt from a monobasic calcium salt. On treating an 

 aqueous solution of the monobasic calcium salt of this acid in 

 the same manner, viz: with baryta water, and heating to boil- 

 ing, a white flocculent precipitate is obtained, which after 

 washing with hot water and drying at 100° C. gave by analysis 

 the formula: CgH,,Ba"0-. 



I. 0-282 grams of the salt dried at 100° C. gave -2192 grame 

 CO2 and -0905 grams H3O. 

 II. 0-1585 grams of the dried salt gave '1235 grams COg and 



•0505 grams HgO. 

 Ill 0-3255 grams of the dried salt gave -192 grams BaCOg. 

 * Annalen der Ch. u. Pharm., clviii, 253. 



