Over his lifetime , Cope 's views on evolution shifted . His original view , described in the paper `` On the Origin of Genera '' ( 1868 ) , held that while Darwin 's natural selection may affect the preservation of superficial characteristics in organisms , natural selection alone could not explain the formation of genera .
Over his lifetime Cope 's views on evolution shifted.p250 His original view , described in the paper `` On the Origin of Genera '' ( 1868 ) , held that while Darwin 's natural selection may affect the preservation of superficial characteristics in organisms , natural selection alone could not explain the formation of genera .