SINCE the appearance of the first edition the publications of greatest value on the subject of anthocyanin pigments have been in connection with the chemistry and biochemistry of these substances. This later work has now been included, and the present state of our knowledge of the significance of the pigments in relation to plant metabolism has, as far as possible, been indicated.
The consideration of the more recent investigations on Genetics in which the anthocyanin pigments are involved has presented difficulties, in view of the large number of papers published. An attempt has been made to record the majority of these publications, but it has been impossible, within the size and scope of this book, to give detailed accounts of the researches on the inheritance of soluble pigments. Such curtailment, however, should not be serious, for many of the results indicated have not greatly increased our special knowledge, either of the inter-relation-ships of the pigments, or of the bearing of their chemical constitution on the inheritance of colour.
Recent work on Genetics, nevertheless, has considerably broadened our general conceptions of Mendelian factors and has prepared the way towards that elucidation which, unquestionably, in the course of time, will be found of the relations between the chemistry and biochemistry of the anthocyanin pigments and the factors for colour-inheritance.

PART I GENERAL ACCOUNT

CHAP. I. INTRODUCTORY PAGE 3

CHAP. II. THE MORPHOLOGICAL DISTRIBUTION OF ANTHOCYANINS PAGE 20

CHAP. III. THE HISTOLOGICAL DISTRIBUTION OF ANTHOCYANINS PAGE 32

CHAP. IV. THE PROPERTIES AND REACTIONS OF ANTHOCYANINS PAGE 46

CHAP. V. THE ISOLATION AND CONSTITUTION OF ANTHOCYANINS PAGE 59

CHAP. VI. PHYSIOLOGICAL CONDITIONS AND FACTORS INFLUENCING THE FORMATION OF ANTHOCYANINS PAGE 82

CHAP. VII. REACTIONS INVOLVED IN THE FORMATION OF ANTHOCYANINS PAGE 105

CHAP. VIII. THE SIGNIFICANCE OF ANTHOCYANINS PAGE 129

PART II ANTHOCYANINS AND GENETICS

CLASSES OF VARIATION 147

DETAILS OF CASES OF MENDELIAN INHERITANCE IN COLOURVARIETIES 157

CONNECTION OF FLOWER-COLOUR WITH THE PRESENCE OF ANTHOCYANIN IN VEGETATIVE ORGANS, FRUITS AND SEEDS 190

HETEROZYGOUS FORMS 194

PATTERN IN COLOUR-VARIATION 196

STRIPED VARIETIES AND BUD-VARIATION 198

BIBLIOGRAPHY 208

INDEX 300

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