via CONTENTS 



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CHAPTER IV. THE PROPERTIES AND REACTIONS or ANTHO- 



CYANINS 44 



Question as to Number of Pigments Included in the Group Crystal- 

 line Form Solubilities Qualitative Reactions With Alkalies With 

 Acids With Lead Acetate Reactions of Accompanying Substances 

 Weigert's Classification Willstatter's Interpretation of Colour Reactions 

 Reactions with Iron Salts With Sodium Bisulphite Action of 

 Nascent Hydrogen Compounds with Acids Spectroscopic Exami- 

 nation Willstatter's Groups of Anthocyanins. 



CHAPTER V. THE ISOLATION AND CONSTITUTION OF ANTHO- 

 CYANINS 58 



General Views Special Cases of Isolation and Analyses Flower-pig- 

 ment of Centaurea by Morot Pigment of Wine by Glenard Pigment 

 of Coleus Leaves by Church Flower-pigment of Rosa by Senier Pig- 

 ment of Wine by Gautier Pigment of Grapes by Heise Pigment of 

 Red Vine Leaves by Gautier Flower-pigment of Althaea by Glan 

 Fruit-pigment of Bilberry by Heise Flower-pigment of Pelargonium by 

 Griffiths Flower-pigment of Althaea and Pelargonium by Grafe 

 Flower-pigment of Antirrhinum by Wheldale Flower-pigment of Cen- 

 laurea, Delphinium, Malva, Pelargonium and Rosa and Fruit-pigment 

 of Vaccinium by Willstatter Constitution of Anthocyanins. 



CHAPTER VI. PHYSIOLOGICAL CONDITIONS _AND FACTORS IN- 

 FLUENCING THE FORMATION OF ANTHO- 

 CYANINS 81 



Connection with Photosynthesis Connection with Accumulation of 

 Synthetic Products Formation as Result of Mechanical Injury and 

 Injury by Insects and Fungi As Result of Pecortication Formation 

 in Alpine Plants In Parasites Connection with Nutrition Effect 

 of Temperature Effect of Light Varying Results in Flowers, Stems, 

 Leaves and Roots Connection with Presence of Oxygen Analyses of 

 Gaseous Exchange in Red Leaves Effect of Drought Effect of Sugar- 

 feeding Experiments of Overton, Katie and Gertz Summary of 

 Results. 







CHAPTER VII. REACTIONS INVOLVED IN THE FORMATION OF 



ANTHOCYANINS 104 



Early Views as to Origin of Anthocyanin from Chlorophyll and Tannins 

 Palladin's Respiration Pigments Oxidase Reactions in Plants Hypo- 

 thesis as to Origin from Flavones Criticism of Hypothesis Evidence 

 for Hypothesis from Results of Cross-breeding From Analogous 

 Reactions From Connection with Photosvnthesis From Gaseous 



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Exchange in Red Leaves Work of Keeble, Armstrong and Jones on 

 Oxidases and Anthocyanins Formation of Artificial Anthocyanin 

 Results of Combes and Willstatter. 



