INDEX. 



1351 



Urine, determination of nitrogen in, 1257 

 ,, phenylsulphuric acid in, 1279 

 ,, pyroeatechin in, 1279 

 „ pigments of, 1307, 1308 

 Urobilin, its identity with hydrobiliru- 

 bin, 1306, 1307 

 ,, preparation of, 1308 



,, spectra of, 1308 



Urochrome, 1308 

 Uroerythrin, 1308 

 Urohasmatoporphyrin, 1308 



Valeric or valerianic acid, 1227 

 Vegetable alkaloids, their analogy with 



ptomaines, 1284, 1285 

 Vegetable tissues, allantoin found in, 1262 

 ,, ,, xanthine found in, 1265 



,, ,, occurrence of hypo- 



xan thine 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, 1314 



Visual-purple, spectroscopic properties, 



1314 

 Vitellin, chemistry and preparation of, 



1172 



Weidel'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 

 Zymogen, an antecedent of the enzymes, 

 1189 

 ,, of pepsin, 1191 



„ of trypsin, 1193 



Zyniolysis, 1183, note, 1188 



