244 BIBLIOGRAPHY 



Page of ti'\t 

 on which 

 reference 

 is made 



sulphuretted hydrogen and subsequent purification. Found 

 to contain carbon, hydrogen and oxygen only, but no 

 constant analysis results. Reactions with acids, alkalies, 

 salts of metals and various natural waters. Pigment 

 termed liguline. 



132. 1860. Filhol, E., 'Note sur quelques matieres colorantes 



vegetales,' C. R. Acad. sci., Paris, 1860, L, pp. 545-547. 

 Further account of the properties of the substance 

 which gives a yellow colour in white flowers on treatment 

 with alkali. It was found to occur also in green parts of 

 plants and to be analogous to luteolin ; absent from some 

 flowers, Pelargonium and Papaver, which become blue or 

 violet with alkalies. pp. 8, 49, 50 



133. Filhol, E., 'Nouvelles recherches sur les matieres 

 colorantes vegetales,' C. R. Acad. sci., Paris, 1860, L, 

 pp. 1182-1185. 



Author is of the opinion that there is only one kind of 

 red or blue soluble pigment (cyanine). Differences in 

 colour due to other substances in the cell -sap. 



134. 1862. Chevreul, ' Observations sur la propriete decolorante do 



I'eau oxygenee melee avec plusieurs matieres colorees 

 d'origine organique,' C. R. Acad. sci., Paris, 1862, LV, 

 pp. 737-738. 



Action of hydrogen peroxide on soluble flower pigments. 

 Bleaching takes place. 



135. Wiesner, J., 'Einige Beobachtungen iiber Gerb- und 

 Farbstoffe der Blumenblatter,' Bot. Ztg., Leipzig, 1862, 

 xx, pp. 389-392. 



Researches on reactions given by tissues with iron salts 

 and alkalies. If a colourless cell-sap contains a tannin 

 which gives a green colour reaction with iron salts, it also 

 gives a yellow reaction with alkalies: if a blue reaction 

 with iron salts, no colour with alkalies. Anthocyanin 

 itself gives a blue colour with alkalies, never green. Hence, 

 when the former kind of tannin is present with ant ho - 

 cyanin, the cell-sap gives a green, i.e. blue plus yellow, 

 reaction with alkalies; when the latter, a blue reaction 

 only. pp. 8, 45, 50 



136. Wigand, A., 'Einige Satze iiber die physiologische 

 Bedeutung des Gerbstoffes und der Pflanzenfarbe,' Bot. 

 Ztg., Leipzig, 1862, xx, pp. 121-125. 



Distribution of tannin and pigments in leaves, stems 

 and flowers. It is stated that anthocyanin has no relation 

 to chlorophyll, but arises from a colourless chromogen, 

 which is a tannin, and gives a yellow colour with alkalies. 



