284 EXPERIMENT STATION RECORD. 



The use of this solution makes the usual addition of the 15 gni. of 

 ammonium nitrate to the phosphate solution unnecessary. — ii. j. 



PATTERSON. 



The polarimetric determination of lactose in human milk, P. 

 ThibaULT {Jour. Fharm. et Chim., ser. 0, 4 (1896), i)p. 5-10; abs. in 

 Chem. Centbl., 1896, II, No. 6, p. ,5^<S).— The method possesses the 

 advantage of rapidly giving clear filtrates. The clarifying solution 

 consists of 10 gm. pure i)icric acid and 25 cc, glacial acetic acid in a 

 liter of water. Twenty cc. of milk is shaken with the same volume of 

 the clarifying solution, whereby the albuminoids are coagulated. The 

 clear yellow filtrate is polarized in a 200 mm. tube. The rotatory power 

 is not influenced by the picric acid. The author accepts Tanret's figure 

 53 for [a]^ of lactose +IH2O. Two divisions on the vernier therefore 

 correspond to 3.88 gm. lactose per liter of milk, which includes the cor- 

 rection for the removed albuminoids. — w. H. kruo. 



The detection of pentoses by precipitation with phloroglucinol 

 and hydrochloric acid, B. Tollens [Ber. dvut. chem. Ges., 29 {1896), 

 p. 1202). — -When the pentoses are warmed with phloroglucinol and 

 hydrochloric acid a cherry-red color is produced and the solution gives 

 a characteristic absorption band situated on the more refrangible side 

 of the sodium line. With continued heating the solution becomes dark 

 and a precipitate is finally formed. When this is filtered off and 

 washed it may be dissolved in alcohol, and this solution also exhibits 

 the absorption band quite distinctly. Tlius urine containing 1 part 

 arabinose in 1,000 did not show the baud, while the alcoholic solution 

 of the precipitate showed it clearly. This appears to be the limit of 

 sensibility of the reaction, and it is less delicate in the presence of 

 other sugars. Pentoses have been detected in various wines by this 

 method. Tlie urine of a sheep fed on peanuts and hay appeared to be 

 free from pentoses. — ^X. h. krug. 



Chloraloses, M. Hanriot {Compt. Bend., 122 {1896), No. 20, p. 1127; 

 ahs. in Jour. Chem. Soc, 1896, Sept., i). 619). — Galactose readily combines 

 with chloral in the presence of a little hydrochloric acid when heated 

 to 100°, and gives « and p galacto=chloral, CgnnCLjOe. The latter 

 crystallizes from water or methyl alcohol in nacreous lamellte, which 

 do not sublime readily even in vacuo, are almost insoluble in water and 

 ether, and melt at 202°. It has no action on Fehling's solution. When 

 oxidized with potassium permanganate it gives chloralic acid, C-H-ClsOe, 

 which is identical with the acid obtained from arabino chloral, and 

 melts at 307°. 



Levulose under similar conditions at 80° gives levulochloral, 

 CgHnClaOe, crystallizing in long needles, very soluble in hot water or 

 alcohol, melting point, 228°. — w. h. krug. 



The separation of sugars by means of new hydrazones, A. von 

 EcKENSTEiN and C. A. Lobry de Bruyn {Rec. trar. Chim. Fays-Bas, 

 15 {1896), p. 97; abs. in Jour. Soc. Chem. Ind., 15 {1896), No. 9, p. 

 679). — The sugars can be separated by means of other hydrazins than 



