Evolution and Natural Selection

acquired action adapted afterwards Alfred Russel Wallace animals and plants apes appear archipelago Asa Gray Beagle become believe birds cause character Charles Darwin Chatham Island colour degree developed divergence domestic doubt early progenitors effect Emma Darwin Emma Wedgwood Erasmus Darwin existence expression extinct extremely fact father favourable female flower forms genera genus geological gradations greater number groups habits Henslow important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate islands Josiah Wedgwood kind less Letters living lower animals Lyell Maer males mammals manner mental mind monkeys muscles natural selection naturalists never object observed occasionally offspring organs Origin of Species perfect period pollen present principle probably produced races reason relation remarkable Robert Waring Darwin savages sexual selection Shrewsbury skull slight structure supposed swimbladder tail tend theory tion tortoise trees variations varieties vertebrate voyage Wedgwood whilst young