English: The first book was On the Origin of a Species which was published in 1859, the second book was The Descent of Man which was published in 1871.
Telugu: ఆయన మొదటి పుస్తకం “ఆన్ ది ఆరిజిన్ ఆఫ్ ఏ స్పీసీస్ “(On the Origin of a Species) 1859లో , రెండవ పుస్తకం “ది డిసెంట్ ఆఫ్ మాన్”(The Descent of Man) 1871లో ప్రచురింపబడినవి.