INDF.X 



1351 



Urine, determination of nitrogen in, 1257 

 phenylsiilpliiiric arid in, I'JT'.i 

 ,, pyronatechin in, l-T!i 

 ,, pigments of, 1307 

 Urobilin, its identity with hydrobiliru- 



bin, 1306, 1307 

 preparation of, 1308 

 ,, spectra of, 1308 

 I'roi-hrome, 1308 

 Uroerythrin, 1308 

 Urohsematoporphyrin, 1308 



Valeric or valcrianic acid, 1227 

 Vegetable alkaloids, their analogy with 



ptomaines, 1284, 1285 

 Vegetable tissues, allantoin found in, 1262 

 ,, ,, xanthine found in, 1265 



,, ,, occurrence of hypo- 



zanthine in, 1268 

 occurrence of guanine 



in, 1270 

 ,, occurrence of skatol in, 



1284 

 Visual-purple, 1313 



,, preparation in solution, 1313 



action of light and reagents 

 on, 1311 



Visual-purple, spectroAcopic properties, 



1.'514 

 Vitellin, chemistry and preparation of, 



1172 



Wriflrl's reaction for xanthine, 1265 

 Weyl's reaction for creatinine, 1250 



Xanthine group, the, 1263-1272 

 Xanthine, its relationship to uric acid, 

 1264 



,, preparation of, 1265 



reactions for, 1265 



,, derivatives of, 1271 



,, physiological action of, 1272 

 Xanthocreatinine, 1286 

 Xanthophane, 1313 



Xanthoproteic reaction for proteids, 1166 

 Xanthopsin, 1314 



Zinc lactate, 1233 



,, sarcolactate, 1234 

 Zymogeu, an antecedent of the enzymes, 



1189 



of pepsin, 1191 

 of trypsin, 1193 

 Zymolysis, 1183, note, 1188 



