BIBLIOGRAPHY 237 



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is unspotted, and is inclined to believe that the same is 

 true for Great Britain, though the spotted form may be 

 more abundant in this country than in Ireland. Descrip- 

 tion given of form of spots. p. 19 



74. Garjeanne, A. J. M., 'Buntblatterigkeit bei PolygonumS 

 Beihefte zum Bot. Centralbl., Jena, 1903. xm, pp. 203-210. 



A description of varieties of several species of Poly- 

 gonum in which chlorophyll is absent from portions of the 

 leaves. Hence the usual dark leaf-blotch of anthocyanin 

 shows bright red. p. 19 



75. Gunn, W. F., 'Arum maculatum again,' Irish Nat., 

 Dublin, 1903, xn, p. 219. 



.Suggestion that black spotted form is a variety. 



76. Lindinger, L., 'Anatomische und biologische Unter- 

 suchungen der Podalyrieensamen,' Beihefte zum Bot. 

 Centralbl., Jena, 1903, xiv, pp. 20-61. 



Mention is made of the histological distribution of 

 anthocyanin in the seed-coats of several genera. pp. 27, 41 



77. Parkin, J., 'On the Localisation of Anthocyan (red 

 cell-sap) in Foliage Leaves,' Rep. Brit. Ass., London, 1903, 

 p. 862. 



Investigation of the seat of anthocyanin in leaves 

 reddened through various causes. See text. pp. 3, 37, 89 



78. Pethybridge, G. H.. 'The Leaf -spots of Arum macu- 

 latum,' Irish Nat., Dublin, 1903, xii, pp. 145-151. 



From data collected, the author finds that the form 

 with spotted (anthocyanin) leaves is less widely distributed 

 in Great Britain than the unspotted. Remarks 011 the 

 structure and significance of the spot. p. 19 



79. 1906. Wittmack, L., 'Violette Weizenkorner,' SitzBer. Ges. 



natf. Freunde, Berlin, 1906, pp. 105-108. 



Anthocyanin in outer layers of wheat grain. 



80. 1910. Exner, F. und S., 'Die physikalischen Grundlagen der 



Bliitenfarbungen,' Anz. Ak. Wiss., Wien, 1910, XLVII, 

 pp. 11-12. 



The authors maintain that, apart from differences in 

 pigmentation, the colours of flowers may be modified by 

 physical phenomena arising from structural features of 

 the petal. Examples are the heightening of epidermal 

 colour by a sub-epidermal air-containing layer ; the 

 deadening of tints when pigments of complementary 

 colours are mixed; the raising of colour saturation by 

 reflexion caused by the epidermal papillae. 



81. *Paasche, E., Beitrdge zur Kenntnis der Fdrbunyen und 

 Zeichnungen der Blulen und der VerteUung von Anthocyan 



