BIBLIOGRAPHY 255 



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219. Combes, R., 'Recherches sur la formation cles pigments 

 anthocyaniques,' C. R. Acad. set., Paris, 1911, CLIII, 

 pp. 886-889. 



Microchemical tests for anthocyanin and its chromogen 

 in tissues of Ampelopsis. 



220. Combes, R., 'Recherches microcliimiques sur les pig- 

 ments anthocyaniques,' C. R. ass. franc, avnnc. scL, Paris, 

 1911, pp. 464-471. 



Same as preceding paper. 



221. Gautier, A., 'Sur les mecanismes de la variation des 

 races et les transformations moleculaires qui accompagnent 

 ces variations,' C. R. Acad. sci., Paris, 1911, CLIII, pp. 531- 

 539. 



Connection between variation and chemical constitu- 

 tion. Analyses of pigments from different varieties of 

 grapes. 



222. Grafe, V., 'Studien iiber das Anthokyan (III. Mittei- 

 lung),' SitzBer. Ak. Wiss., Wien, 1911, cxx (Abt. 1), 

 pp. 765-807. 



Important paper on the red pigment of Pelargonium 

 flowers. See text. pp. 9, 46, 55, 56, 58, 66 



223. Kastle, J. H., and Haderu R. L., ' On the Color Changes 

 occurring in the Blue Flowers of the Wild Chicory, 

 Cichorium Intybus,' Amer. Chem. J., Baltimore, Md., 1911, 

 XLVI, pp. 315-325. 



Author shows that changes in colour exhibited by 

 flowers on withering are due, in part, to variations in 

 amount of acid in the pigmented cells, and, in part, to the 

 action of an oxidase which oxidises and destroys the plant 

 pigment. 



224. Nierenstein, M., und Wheldale, M., 'Beitrag zur 

 Kenntnis der Anthocyaniiie. 1. Ueber ein anthocyanin- 

 artiges Oxydationsprodukt des Quercetins,' Ber. D. chem. 

 Ges., Berlin, 1911, XLIV (3), pp. 3487-3491. 



Description of a red pigment formed on oxidation of 

 quercetin with chromic acid. Properties of oxidised pro- 

 duct resemble anthocyanin in some respects. 



225. Politis, I., 'Sopra speciali corpi cellulari che formano 

 Antocianine,' Rend. Ace. Lined, Roma, 1911, xx, pp. 828- 

 834. 



Hypothesis, supported by microscopical and micro- 

 chemical observations, that anthocyanin is produced by 

 special bodies termed cyanoplasts, which contain tannin 

 substances capable of forming anthocyanin. On dis- 

 integration of cyanoplast, anthocyanin colours the cell -sap. 



