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Show LONDON: PRINT ED BY W. CLOWES AND SONS, STAMFORD 61' Itt•: lc'L' , AND CIIARING CROSS. CONTENTS. INTRODUCTION Page 1 CHAPTER I. VARIATION UNDER DoMESTIOATION. Causes of Variability- Effects of Habit- Correlation of Growth-Inheritance- Character of Domestic Varieties- Difficulty of distinguishing between Varieties and Species-Origin of Domestic Varieties from one or more Species- Domestic Pigeons, their Differences and Origin- Principle of Selection anciently followed, its Effects-Methodical and Unconscious Selection- Unknown Origin of our Domestic Productions- Circumstances favourable to Man's power of Selection 7-43 CHAPTER II. VARIATION UNDER NATURE. Variability- Individual differences- Doubtful species- Wide ranging, much diffused, and common species vary most-Species of the larger genera in any country vary more than the species of the smaller genera-Many of the species of the larger genera resemble varieties in being very closely, but unequally, related to each other, and in l;1.aving restricted ranges 44-59 |