ON ABSORPTION SPECTRA OF ORGANIC COMPOUNDS. 373 



U 



Umbelliferone. Tasaki. Acta Phytochim., 3, 21 (1927). 



Uramidonitrophenol. Vies. Compt. rend., 170, 1242 (1920). 



Urea. Castille and Ruppol. Bull. Acad. Roy. Med. Belg., 6, 263 (1926). 



I-Ureido-2:5-dimethylpyiTole-4-carboxylic acid, ethyl ester. Korschun and Roll. 



Bull. Soc. Chim., 37, 130 (1925). 

 l-Ureido-2:5-dimethvlpyrrole-3:4-dicarboxylic acid, ethyl ester. Korschun and Roll. 



Bull. Soc. Chirn"^., 37, 130 (1925). 

 l-Ureido-2:3:5-trimethylpyrrole-4-carboxvlic acid, ethyl ester. Korschun and Roll. 



Bull. Soc. Chim., 37,"l30 (1925). 

 Uric acid. Castille and Ruppol. Bull. Acad. Roy Med. Belg., 6, 263 (1926). 



,, ,, Damianovich and Williams. Anal. Soc. Cient., Argentina, 98, 241 (1925). 

 Uroporphj^rin ester. Hausmann and Krumpel. Biochem. Zeit., 186, 203 (1927). 



Vanillin. Herzog and HiUmer. Ber., 60, 365 (1927). 



Steiner. Compt. rend., 176, 744 (1923). 

 Veratrol. Steiner. Compt. rend., 175, 1146 (1922) ; 176, 744 (1923). 

 1-Veratryl-norhydrohydrastinin. Kitasato. Acta Phytochim., 3, 175 (1927). 

 Victoria blue B. Holmes. J. Ind. Eng. Chem., 16, 35 (1924). 

 Victoria green. Holmes. J. Amer. Chem. Soc, 46, 631 (1924). 



,, ,, isopropyl. Holmes. J. Amer. Chem. Soc, 46, 631 (1924). 



Vinylenefurols. Konig. Ber., 58, 2559 (1925). 

 Violamine. Wales. J. Amer. Chem. Soc, 45, 2420 (1923). 

 Violuric acid. Morton and Tipping. Trans., 127, 2514 (1925). 

 Visible purple. Hecht and Williams. J. Gen. Physiol., 5, 1 (1922). 



W 



Wogonin. Shibata, Iwata and Nakamura. Acta Phytochim., 1, 105 (1923). 

 Worenin. Ivitasato. Acta Phytochim., 3, 175 (1927). 



X 



Xanthene. Tasaki. Acta Phytochim., 3, 1 (1927). 



Xanthogenic acid, salts. Hantzsch and Bucerius. Ber., 59, 793 (1926). 



Xanthone. Tasaki. Acta Phytochim., 3, 1 (1927). 



m-Xylene. Klingstedt. Acta Acad. Aboensis Math. Phys., 3, 1 (1924) ; Compt. rend., 



175, 1065 (1922). 

 o-Xylene. Klingstedt. Acta Acad. Aboensis Math. Phys., 3, 1 (1924) ; Compt. rend., 



175, 1065 (1922). 

 jj-Xylene. Klingstedt. Acta Acad. Aboensis Math. Phys., 3, 1 (1924) ; Compt. rend., 



175, 1065 (1922). 

 Xylene yellow. Stumpf. Zeit. wiss. Phot., 20, 183 (1921). 

 Xylenol. Ley. Zeit. phys. Chem., 94, 405 (1920). 



Purvis. Trans., 125, 406 (1924). 

 wi-XyUdine orange. Thiel, Dassler and Wiilfken. Fortschritte Chem. Phys., 18, 79 



(1924). 

 jj-XyUdine orange. Thiel, Dassler and Wiilfken. Fortschritte Chem. Phys., 18, 79 



(1924). 

 Xylol-pyrrolino-anthranol-azyl. Scholl. Ber., 60, 1236 (1927). 

 p-Xyloquinone. Light. Zeit. phys. Chem., 122, 414 (1926). 



Purvis. Trans., 123, 1841 (1923). 

 w-Xylyl-pen-pyrroUno-anthranol-azyl. Scholl, Stix and Semp. Ber., 60, 1685 (1927). 

 ,, ,, ,, ,, ,, benzoyl derivative. Scholl, Stix and Semp. 



Ber., 60, 1685 (1927). 



