BIBLIOGRAPHY 253 



Tage of text 

 on which 

 reference 

 is made 



like substances. Red products are obtained by the action 



of various reagents on tannins. p. 106 



202. Malvezin, Ph., 'Sur Forigine de la couleur des raisins 

 rouges,' C. E. Acad. sci., Paris. 1908, CXLVII, pp. 384-386. 



Water extracts of unripe red (or white) grapes, heated 

 for 24 hours at 85, give red pigment, but not in absence of 

 air. Absence of pigment in white grapes in nature is due 

 to lack of diastase, but high temperature will cause oxida- 

 tion (artificially). 



203. Palladia, W., 'Ueber die Bildung der Atmungschromo- 

 gene in den Pflanzen,' Ber. D. bof. Ges., Berlin, 1908, 

 xxvi a, pp. 389-394. 



Suggestion that anthocyanin is a respiration pigment. 



pp. 11, 58, 91,99, 101, 107 



204. Portheim, L. von, und Scholl, E., 'Untersuchungen viber 

 die Bildung und den Chemismus von Anthokyanen,' Ber. 

 D. hot. Ges., Berlin, 1908, xxvia, pp. 480-483. 



Method described for purification of anthocyanin by 

 dialysis. Anthocyanin is also prepared from testas of 

 seeds of Pkaseolus multijlorus by extraction with alcohol. 

 By fractional crystallisation, yellow and red crystalline 

 products are obtained. p. 46 



205. Russo, Ph., 'Des pigments floraux,' C. R. soc. bioL, 

 Paris, 1908, LXV, pp. 579-581. 



Examination of pigments of many flowers with 

 tournesol paper leads to the conclusion that, in the cyanic 

 series, flower colour varies in tint according to the greater 

 or less acidity of the cell-sap. 



206. Sorby, H. C., 'On the Colouring Matters of Flowers,' 

 Nature, London, 1908, LXXVII, pp. 260-261. 



Note on the solubilities of various flower pigments ; also 

 observations as regards spectra. 



207. 1909. Combes, R., 'Rapports entre les composes hydro- 



carbones et la formation de 1'anthocyane,' Ann. sci. nat. 

 (Bot.}, Paris, 1909, ser. 9, ix, pp. 275-303. 



View held that an increase in amount of sugars and 

 glucosides in tissues leads .to increase in formation of 

 anthocyanin. Estimation is made of glucosides and 

 sugars in various green and red leaves. Found that red 

 leaves contain considerably greater quantities of these 

 substances than green control leaves. pp. 4, 83, 117 



208. Combes, R., ' Recherches biochimiques sur le developpe- 

 ment de 1'anthocyane chez les vegetaux,' C. R. Acad. set., 

 Paris, 1909, CXLVIII, pp. 790-792. 



Same results as in preceding paper. 



