BIBLIOGRAPHY 245 



Page of text 

 on which 

 reference 

 is made 



The chromogen, on oxidation, gives rise to anthocyanin. 

 With alkalies, blue anthocyanin turns green, then yellow ; 

 red anthocyanin turns first blue, then green, and finally 

 yellow. pp. 8, 44, 50, 58, 91, 106 



137. 1866. Gmelin, L., Fortsetzung des Handbuchs der organischen 



Chemie, Heidelberg, 1866, Bd iv (2), pp. 1421-1430. 



Important summary of chemical work on anthocyanin 

 up to this period. p. 105 



138. 1867. Nageli, C., und Schwendener, S., Das Mikroskop, 



Leipzig, 1867, n, pp. 500-509. 



An account of the reactions of anthocyanin including 

 a discussion on the significance of its reaction with alkalies. p. 50 



139. Sorby, H. C., 'On a definite Method of Qualitative 

 Analysis of Animal and Vegetable Colouring-Matters by 

 means of the Spectrum Microscope,' Proc. R. Soc., London, 

 1867, xv, pp. 433-455. 



The spectrum microscope can be applied to the exami- 

 nation of pigments of flowers and fruits. Methods de- 

 scribed for use and preparation of pigments to be examined. 

 Numerous reagents are used for developing spectra, and 

 a classification of the latter is outlined. p. 56 



140. 1870. Schonn, 'Ueber Blattgriin und Blumenblau,' Zs. anal. 



Chem., Wiesbaden, 1870, ix, pp. 327-328. 



Note on spectroscopic examination of pigments. 



141. 1871. Vries, H. de, 'Sur la permeabilite du protoplasma des 



betteraves rouges,' Arch. Neerl. Sci. Soc. HolL. Haarlem, 

 1871, vi, pp. 117-126. 



Relative permeability of living and dead protoplasm to 

 coloured cell -sap. p. 29 



142. 1872. Wiesner, J., 'Untersuchungen iiber die Farbstoffe 



einiger fiir chlorophyllfrei gehaltenen Phanerogamen,' 

 Jahrb. wiss. Bot., Leipzig, 1872, vin, pp. 575-594. 



Pigment bodies in Neottia Nidus-avis and Orobanche 

 spp. Red pigment of Orobanche. Discussion as to the 

 nature of the anthocyanin reaction with alkalies. p. 50 



143. 1873. Kraus, C., 'Ueber die Ursache der Farbung der Epi- 



dermis vegetativer Organe der Pflanzen,' Flora, Regens- 

 burg, 1873, xxxi, pp. 316-317. 



Suggestions as to chemical substances from which 

 anthocyanin is derived. 



144. Sorby, H. C., 'On Comparative Vegetable Chroma- 

 tology,' Proc. R. Soc., London, 1873, xxi, pp. 442-483. 



Method of separation of plastid pigments from others 

 by means of carbon bisulphide as a solvent. Spectro- 

 scopical examination of all kinds of pigments. Suggestion 



