Darwinism: An Exposition of the Theory of Natural Selection, with Some of Its Applications

abundant adapted adduced allied species amount animals and plants appears artificial selection become birds breed butterflies carnivora cause characters climate closely allied colours of animals common considerable conspicuous continued correlated cross-fertilisation crossed curious Darwin distinct species divergence domestic animals effects eggs enemies Eocene evidence extinct facts faculty favourable female fertile fertilised flowers forms fruits genera genus geological groups habits hybrids important increase infertility inhabit insects intercrossing isolation kind large number larvæ less living male mammalia mammals markings marsupials mimicry Miocene mode modified natural selection naturalists nests number of individuals occur offspring organs Origin of Species pair peculiarities physiological pigeons Pliocene pollen portion possess probably produced Professor proportion protectively coloured races remarkable resemble seeds Silurian specimens stamens sterility structure struggle for existence supposed tail theory tion trees tropical usually variability variation varied varieties vegetable warning colours whole wild wings