BIBLIOGRAPHY 241 



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the flowers upon it, and you shall see the Ants creep very 

 thick over them. Now as they creep, they let fall a drop 

 of liquor from them, and where that chanceth to light, 

 there you shall have in a moment a large red stain.' The 

 author was able to show eventually that the same colora 

 tiort could be obtained by treating the petals with various 

 acids. 



109. 1671. Lister, M., 'Some Observations, touching Colours, in 



order to the Increase of Dyes, and the Fixation of Colours,' 

 Phil. Trans. R. Soc., London, 1671, vi, pp. 2132-2136. 

 Among other reactions, it is noted that the green parts 

 of plants give a yellow colour with alkalies. 



110. 1807. Braconnot, H., 'Observations sur le phytolacca, vulg. 



raisin d'amerique,' Annales de Chimie, Paris, 1807, ~LS.II, 

 pp. 71-90. 



An extract is made of the berries, and the effect of 

 various reagents is tried, such as acids, alkalies, salts of 

 metals. It is noted that the behaviour of the pigment 

 towards reagents is different from that of other fruits. p. 8 



111. 1808. Melandri, G., 'Ex trait d'une lettre de M. G. Melandri, 



docteur en medecine, a Milan, a M. Bouillon-Lagrange,' 

 Annales de Chimie, Paris, 1808, LXV, p. 223. 



Use of pigment of fruits of Atropa Belladonna as an 

 indicator. 



112. 1818. Smithson, J., 'A few facts relative to the colouring 



matters of some vegetables,' Phil. Trans. R. Soc., London, 

 1818 (1), pp. 110-117. 



Reactions of pigments of Violet, Black Mulberry and 

 Corn Poppy towards acids, alkalies, etc. The view is held 

 that probably all these pigments are the same substance. p. 44 



113. 1820. Chevallier, A., 'Sur la maniere dont se comporte avec 



les acides et les alcalis la matiere colorante des baies de 

 sureau (sambucus nigra) appliquee siu 1 le papier,' Journal 

 de Pharmacie, Paris, 1820, vi, pp. 177-178. 



Action of acids and alkalies on pigment. Different 

 acids are said to give characteristic reactions with paper 

 soaked with the pigment. p. 8 



114. 1822. Payen, A., et Chevallier, A., 'Sur la fleur de la mauve 



sauvage (malva sylvestris), et particulierement sur la 

 matiere colorante de ses petales, employee comme reactif, 

 soit en teinture, soit etendue sur le papier pour demontrer 

 la presence des alcalis,' Journal de Pharmacie, Paris, 1822, 

 vni, pp. 483-488. 



The pigment is said to be very sensitive to alkalies, and 

 hence is of value as an indicator. p. 8 



w. p. 16 



