BIBLIOGRAPHY 



Tage of text 



on which 



reference 



is made 



the same method from quercetin (see Xo. 224). Product 

 resembles anthocyanin in some of its properties, since it 

 gives a blue colour with alkalies, and red with concentrated 

 sulphuric acid. 



233. 1913. Atkins, W. R. G., 'Oxiclases and their Inhibitors in 



Plant Tissues,' Sci. Proc, E. Soc., Dublin, 1913, xiv (N. S.), 

 pp. 144-156. 



Account of oxidase tests with tissues of various plants. 

 Special attention given to comparison of distribution of 

 oxidases and pigment in the genus Iris. p. 1 19 



234. Combes, R.. 'Production experimental d'une antho- 

 cyane identique a celle qui se forme dans les feuilles rouges 

 en automne, en partant d'un compose extrait des feuilles 

 vertes,' C. R. Acad. so'., Paris, 1913, CLVII, pp. 1002-1005. 



By treating yellow pigment (flavone) occurring in 

 Ampelopsis with nascent hydrogen, the author obtains a 

 purple substance which he maintains to be identical with 

 natural anthocyanin. Hence, contrary to previous views, 

 anthocyanin formation from a flavone is brought about by 

 reduction, not oxidation. See text. pp. 14, 121 



235. Combes, R., 'Passage d'un pigment anthocyanique 

 extrait des feuilles rouges d'automne au pigment jaune 

 contenu dans les feuilles vertes de la meme plante,' C. R. 

 Acad. sci., Paris, 1913, CLVII, pp. 1454-1457. 



Crystalline anthocyanin from Ampelopsis is converted 

 into a flavone by oxidation with hydrogen peroxide. See 

 text, pp. 14, 121 



236. Combes, R., 'Untersuchungen iiber den chemischen 

 Prozess der Bildung der Anthokyanpigmente,' Bcr. D. hot. 

 Ges., Berlin, 1913, xxxi, pp. 570-578. 



Repetition of last two papers. 



237. Jones, W. N., 'The Formation of Anthocyan Pigments 

 of Plants. Part 5. The Chromogens of White Flowers,' 

 Proc. R. Soc., London, 1913, LXXXVI B, pp. 318-323. 



Investigations on presence of chromogens and oxidases 

 in white flowers. See text. p. 120 



238. Jones, W. N., 'Some Investigations in Anthocyan 

 Formation,' Rep. Brit. Ass., London, 1913, p. 713. 



Anthocyanin formation considered to be the result of 

 an 'oxidase system. Summary of previous papers. 



239. Keeble, F., Armstrong. E. F., and Jones, W. N., 'The 

 Formation of the Anthocyan Pigments of Plants. Part 4. 

 The Chromogens.' Proc. R. Soc., London, 1913, LXXXVI B, 

 pp. 308-317. 



Hypothesis, that anthocyanin is formed by oxidation 

 w. p. 17 



