The facts of variation and artificial selection--Proofs of the generality of variation--Variations of apples and melons--Variations of flowers--Variations of domestic animals--Domestic pigeons--Acclimatisation--Circumstances favourable to selection by man--Conditions favourable to variation--Concluding remarks
CHAPTER IV · VARIATION OF DOMESTICATED ANIMALS AND CULTIVATED PLANTS
From Darwinism: An Exposition of the Theory of Natural Selection by Alfred Russel Wallace.
