BIBLIOGRAPHY 251 



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188. 1901. Goppelsroeder, Fr., Capillar analyse beruhend auj 



Capillaritdts- und Adsorptionserschemungen mil dem 

 Schlusskapitel: Das Emporsteigen der Farbstoffe in den 

 Pflanzen, Basel, 1901. 



Method which can be adapted to the separation of 

 mixtures of pigments in solution. Strips of specially pre- 

 pared filter paper are allowed to dip slightly into the 

 solutions, and the various pigments rise by capillarity to 

 different heights. By cutting off zones of paper, and by 

 repetition of the process, a certain amount of pure pigment 

 can be obtained. 



189. 1902. Bouffard, A., 'Action de I'acide sulfureux sur 1'oxydase 



et sur la matiere colorante du vin rouge,' C. R. Acad. sci., 

 Paris, 1902, cxxxiv, pp. 1380-1383. 



Action of acid considered to be twofold: first, preser- 

 vation of the colour of the wine, and secondly, a destructive 

 action on the oxidising enzyme. 



190. Sostegni, L., 'Sulle materie coloranti delle uve rosse,' 

 Gazz. chim. ital., Roma, 1902, xxxn (2). pp. 17-19. 



Continuation of analysis of pigment from grapes. 



191. 1903. Griffiths, A. B., 'Die Pigmente des Geraniums und 



anderer Pflanzen,' Ber. D. chem. Qes., Berlin, 1903, 

 xxxvi (4), pp. 3959-3961. 



Account of analyses and properties of pigment, pp. 46, 58, 63 



192. Ichimura, T., 'On the Formation of Anthocyan in the 

 Petaloid Calyx of the Red Japanese Hortense,' J. Coll. 

 Sci., Tokyo, 1903-1904, xvm, art. 3, pp. 1-18. 



Stages of development of anthocyanin in the calyx. 

 View that pigment arises from a tannin -like substance, 

 protanthocyan, which gives a yellow colour with alkalies, 

 and is probably identical with Wigand's cyanogen (see 

 No. 136). In final stages, violet crystals of pigment were 

 observed. p. 31 



193. 1904. Kraemer, H., 'The Origin and Nature of Color in 



Plants,' Proc. Amer. Phil. Soc., Philadelphia, Pa., 1904, 

 XLIII, pp. 257-277. 



Method for extraction and separation of plastid and 

 soluble pigments. Reactions with acids, alkalies, and 

 other reagents are represented in tables. 



194. Naylor, W. A. H., and Chappel, E. J., 'Note on the 

 Colouring Matters of Rosa Gallica,' Pharm. J., London, 

 1904, ser. 4, xix, pp. 231-233. 



Preparation of the pigment. 



195. 1905. Czapek, Fr., Biochemie der Pflanzen, Jena, 1905, Bd i, 



pp. 471-477. 



