78 HANDBOOK FOR BIO-CHEMICAL LABORATORY. 



HOPPE SEYLER'S Test (Xanthin). Add some chloride of 

 lime to some caustic soda in a porcelain dish and add the 

 xanthin to this mixture; at first a dark green and then quick- 

 ly a brownish halo forms around the xanthin-grains and then 

 disappears. 



HUPPERT'S Reaction (Bile Pigments). Treat the solution 

 with milk of lime or with a solution of calcium chloride and 

 then precipitate with ammonia. This precipitate, containing 

 bilirubin calcium, is filtered, washed with water, transferred 

 while moist to a test-tube and treated with alcohol which has 

 been acidified with sulphuric acid, and heated to boiling for 

 some time, when the liquid becomes emerald green or bluish 

 green in color. 



HYDROCHLORIC ACID IN CONTENTS OF STOMACH. See Boas, 

 Ewald, Gunzburg, Herzberg, v. Jaksch, Molir, Maly, Rabu- 

 teau, Reocli, Szabo, Uffelmann, v. Velden, Witz. 



HYDROGEN PEROXIDE. See Wurster. 



HYPOXANTHIN. See Kossel. 



INDICAN. See Jaffe, MacMunn, Obermeyer, Weber. 



INDIGO RED. See Rosenbach, Rosin. 



INDOL. See Baeyer, Nmcki, Salkowski. 



INOSIT. See Gallois, Scherer, Seidel. 



JACQUEMIN'S Test (Phenol). Treat the solution with an 

 equal volume of anilin and then a solution of sodium hypo- 

 chlorite, when a blue coloration is the result. Acids turn the 

 liquid red and alkalies turn it blue again. . 



JAFFE'S Test (Indican). Treat 20 c.c. of the solution to bo 

 tested with an equal volume of hydrochloric acid and add, by 



