Easterfield and Aston. — Chemistry of Tutu. 349 



after a single recrystallisation, gave Ag = 64 - 3 per cent. 

 Calculated for C. 2 H 3 2 Ag, Ag = 64-7 per cent. 



Gallic acid remained in quantity when the solution 

 which had been distilled with steam was evaporated to the 

 crystallising-point and the residue extracted with chloroform. 

 It gave the usual colour reactions. After recrystallisation 

 from water it was dried at 150° and gave — 



C = 49-4 ; H = 3-5 per cent. 



C 7 H 6 5 requires C = 49-0 ; H = 35 per cent. 



Quercetin, or some isomeric compound, was present in 

 the crude gallic acid. After purification by repeated recrystal- 

 lisation from water it showed the usual colour reactions and 

 dyeing properties, lost 2 mols. of water at 160°, and, on ana- 

 lysis, gave — 



C = 592; H = 3-6 per cent. 



C 15 H 10 O 7 requires C = 596 ; H = 3 - 2 per cent. 



Quercetin has been definitely shown by Perkin to exist in 

 C. myrtifolia.* 



The chloroform solution separated from the gallic acid 

 was evaporated and the product dissolved in ether; the re- 

 maining acids were then removed by sodium-carbonate. 



Succinic acid was identified in the alkaline solution. It 

 was recognised by qualitative reactions, melting-point, and 

 analysis of the silver salt. 



= 14-3; H = l-25; Ag = 64-8 per cent. 

 C 4 H 4 4 Ag. 2 requires C = 14-4 ; H=l-2; Ag = 65-0 per cent. 



Tutin. 



The ethereal solution, from which all the acids had been 

 removed, was evaporated, and yielded almost colourless cry- 

 stals, which were repeatedly recrystallised from water and from 

 alcohol. From water the substance separates in character- 

 istic acicular forms, from alcohol in oblique-ended prisms. 

 The compound is perceptibly volatile, may be slowly sublimed 

 at 120°-130°, melts at 208°-209° (uncorr.), and has an in- 

 tensely bitter taste. It contains no nitrogen, and after hy- 

 drolysis by dilute acids reduces Fehling's solution, and w T ith 

 phenylhydrazine gives an amorphous precipitate which is not 

 phenylglucosazone. Strong sulphuric acid added to a few 

 drops of a saturated aqueous solution of tutin gives a blood-red 

 colouration. 



Examination by Zeisel's method for methoxyl groups gave 

 negative results. When evaporated to dryness with slaked 

 lime solutions of tutin yield amorphous compounds amongst 



* Trans, and Journal Chem. Soc, 1900, 77, 429. 



