256 BIBLIOGRAPHY 



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226. Wheldale, M., 'On the Formation of Aiithocyanin,' 

 /. Genetics, Cambridge, 1911, I, pp. 133-157. 



It is suggested that anthocyanin is formed .from gluco- 

 sides of xanthones and flavones, and that the reaction 

 takes place in two stages. First, the hydrolysis of gluco- 

 sides by an enzyme, and then the oxidation of the free 

 flavone by oxidase. Summary of evidence in favour of 

 the hypothesis. pp. 11, 101, 112 



227. *Wissemann, E., Beitrdge ~ur Kennlnis des Auftretens 

 und der topographischen Verteilung von Anthocyan und 

 Gerbstoff in vegetativen Orc/anen, Dissertation, Gottingen, 



1911, 110 pages. 



Respective distributions of anthocyanin and tannin and 

 connection between the same. 



228. 1912. *Chodat, R., 'Les pigments vegctaux,' Verhandl. 



schweiz. Naturforsch. Ges., 95 Jahresversamml. , Altdorf, 



1912, pp. 79-95. 



Action of tyrosinase on gallic acid produces a series of 

 pigments resembling anthocyanin in their reactions. 

 Suggestion made that anthocyanin is derived from tannins. 



229. Keeble, F., and Armstrong, E. F., 'The Oxydases of 

 Cytisus Adami,'' Proc. R. fioc., London, 1912, LXXXV B, 

 pp. 460-465. 



Oxidase reactions of flowers of C. purpureus, C. Adami 

 and C. Laburnum support view of Baur that Adami is a 

 periclinal chimera, composed externally of purpureus and 

 internally of Laburnum. 



230. Keeble, F., and Armstrong, E. F., 'The Distribution of 

 Oxydases in Plants and their Role in the Formation of 

 Pigments,' Proc. R. Soc., London, 1912, LXXXV B, pp. 214- 

 218. 



Oxidase tests upon tissues of plants of all varieties of 

 P. sinensis support view that anthocyanin is the product 

 of activity of an oxidase, and that albinism in Primula is 

 due to loss of chromogen. pp. 11, 117 



231. Keeble, F., and Armstrong, E. F., 'The Role of Oxydases 

 in the Formation of the Anthocyan Pigments of Plants,' 

 J. Genetics, Cambridge, 1912, n, pp. 277-309. 



Previous paper in greater detail. pp. 11, 117 



232. Nierenstein, M., 'Beitrag zur Kenntnis der Antho- 

 cyanine. II. Ueber ein anthocyanin-artiges Oxydations- 

 produkt des Chrysins,' Ber. D. chem. Ges., Berlin, 1912, 

 XLV(l), pp. 499-501. 



Description of a red pigment, formed on oxidation of 

 chrysiri by chromic acid, and similar to that prepared by 



