CHEMISTRY. 107 



The determination of glycogen, and relative quantities of glyco- 

 gen in different parts of the flesh of a horse, J. K. Haywood {Jour. 

 Amer. Chem. Soc, 22 {1900), M. 2, pj). 85-93).— Mt^v testing a num- 

 ber of different methods for gh^cogen the author worked out the fol- 

 lowing, which is a modification of the Briicke method: From 50 to GO 

 gm. of ground meat is treated with 300 (;c. of 1 per cent potassium 

 hydroxid and heated on a steam hath for about 6 hours, water being 

 added from time to time. The solution is evaporated to about 150 cc, 

 made slightly acid with h3Tlrochloric acid, and hydrochloric acid and 

 double iodid of potassium and mercury added alternately until all pro- 

 teid matter is precipitated. The solution is made to a volume of 500 

 cc. and an aliquot filtered and exactly neutralized with concentrated 

 potassium h3'droxid. Three or four drops of concentrated hydrochlo- 

 ric acid is added and twice the volume of 93 to 95 per cent alcohol, the 

 precipitated glycogen filtered off after standing 2 or 3 hours, washed 

 with alcohol and ether, dried at 80 to 100° C, then at 115° C, and 

 weighed. After weighing, the filter is thoroughly extracted with boil- 

 ing water, dried at 115° C, and again weighed, the difference in weight 

 re pr esen ti ng gly coge n , 



The author believes the method to be an improvement over the orig- 

 inal Briicke method and sufficiently accurate for distinguishing horse 

 meat from other meats. 



Analyses are given of the chuck, rib, and flank of 3 different horses, 

 and of the different cuts of meat from another horse. 



The oxid of iron and alumina in mineral phosphates and superphos- 

 phates, MoRiMOXT {Bul. Assoc. Beige Chim., 14 {1900), No. l,pp. 16-18). — Known 

 amounts of iron and alumina oxids, when present in superphosphates, were deter- 

 mined by the method based upon Kroker's reaction (insolubility of iron and alumin- 

 ium phosphates in acetic acid). The amount found exceeded the calculated and 

 known amounts. It was the opinion of the author that the difference was caused 

 l:)y the presence of large amounts of lime. — h. sxyder. 



Resume of the most important investigations in sugar chemistry during 

 the last half of the year 1899 [Deut. Zackerind., 25 {1900), No. 5, pp. 177-181). 



A new gravimetric method of determining reducing sugars, Chapelle 

 {Jour. Pharm. et Chim., 6. ser., 10 {1899), No. 9, pp. 395-398). 



Weighing the precipitated cuprous oxid as cupric oxid in the gravimetric 

 examination of sugar, F. Bolm {Ztschr. Untersuch. Nahr. u. Genussmtl., 2 {1899), 

 No. 9, pp. 689-692). 



The determination of sugar in beets, J. WEisBERCi {Bul. Assoc. Chim. Sucr. el 

 Distill, 17 {1899), No. 3, pp. 237, 238, fig. 1). 



Observations on the electrolysis of cane-sugar solutions, K. Ulsch {Ztschr. 

 Eleclroclicm., 5 {1900), p. 539; abs. iii Jour. Phijs. Chem., 4 {1900), No. 2, p. 157). 



Analyses of sugar-cane molasses and various products in the manufacture 

 of sugar from cane, H. Pellet {Sucr. Indig. et Coloniale, 55 {1900), No. 9, 2'>P- 

 275-278). 



The analysis of golden sirup, N. Leonard {Ancdyst, 25 {1900), Apr., pp. 85-87). — 

 A controversial article based on a previous paper by the author (E. S. R., 11, 

 p. 705). 



