242 BIBLIOGRAPHY 



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115. Payen, A., et Chevallier, A., 'Sur la matiere colorante 

 des fruits du bois de Saiiite-Lucie, cerasus mahaleb,' 

 Journal de Pharmacie, Paris, 1822, vm, pp. 489-490. 



Action of acids and alkalies on the pigment. p. 8 



116. 1825. Roux, J., 'D'analyse chimique de la fleur de tilleul 



(Tilia europaea, L.), et de oelle de la belle-de-nuit,' Journal 

 de Pharmacie, Paris, 1825, xi, pp. 507-512. 



Method for extracting pigment from flowers is described. 

 Also solubilities and reactions with acids and alkalies. p. 8 



117. Schubler, G., und Franck, C. A., Untersuchungen iiber 

 die Farben der Bluthen, Inaugural -Dissertation, Tubingen, 

 1825, 38 pages. 



A number of observations on the action of acids, 

 alkalies and other reagents on flower pigment extracts. 

 Hypothesis of two series of pigments oxidised and 

 deoxidised. p. 104 



118. 1834. Kuhlmann, F., ' Betrachtungen tiber den Einfluss des 



Sauerstoffs auf die Farbung der organischen Produkte xmd 

 tiber die Wirkung der schweflichten Saure als Entfarbungs- 

 mittel,' Annalen der Pharmacie, Heidelberg, 1834, ix, 

 pp. 275-291. 



Remarks on the bleaching of flower-pigments with 

 sulphurous acid. p. 55 



119. 1836. Hiinefeld, 'Beitrage zur Chemie der Metamorphose der 



Pflanzenfarben,' J. prakt. Chem., Leipzig, 1836, ix, pp. 217 

 238. 



Experiments to test the effect on flower -pigments of a 

 number of reagents, such as oxygen, carbon dioxide, water, 

 acids, alkalies, alcohol, metallic salts, etc. 



120. Hunefeld, ' Das mit schwef eliger Saure gesauerte Wasser 

 als Mittel zur Erleichterung der mikroskopischen Unter- 

 suchung von Pflanzentheilen,' J. prakt. Chem., Leipzig, 

 1836, ix, pp. 238-241. 



Bleaching of pigments with sulphurous acid. p. 55 



121. 1837. Berzelius, J., 'Ueber den rothen Farbstoff der Beeren 



und Blatter im Herbst,' Annalen der Pharmacie, Heidel- 

 berg, 1837, xxi, pp. 262-267. 



Description and properties of red pigments of berries 

 and autumnal leaves. Conclusion that they are similar 

 substances. 



122. 1849. Morot, F.S., 'Recherches sur la coloration des vegetaux,' 



Ann. sci. nat. (Bat.), Paris, 1849, ser. 3, xin, pp. 160-235. 



Mainly an account of the properties and chemistry of 

 chlorophyll. Criticism of previous work on soluble pig- 

 ments. Solid blue anthocyanin is prepared from Centaurea 



