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 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 …
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