The Living Thoughts of Darwin

adapted allied animals and plants ants appears beak become modified believe biological biologists birds breeds cause CHARLES ROBERT DARWIN closely colour continent Darwin degree descent developed display distinct species domestic doubt early effect eggs embryos Erasmus Darwin evolution evolutionary extinct fact feathers females formation forms fossils genera genes genus geological groups habits haploid Hence horse important individuals inhabitants inherited insects instance instincts intermediate kinds labellum large numbers larvæ later legs living lower animals males mammals manner marsupials ments modification mutation natural selection naturalists nest neuters occur ocelli offspring organisation Origin Origin of Species period pollinia possess principle produced progenitor pupa quadrupeds relation remarkable resemblance rock-pigeon sanguinea seeds seen sexes sexual characters sexual selection slave-making slaves slight striped structure struggle for existence T. H. Huxley tail theory tion types variability variation varieties various Welsh ponies whilst whole wing worms