The Origin of Species changed the world. When the eminent naturalist Charles Darwin returned from South America on board HMS Beagle in 1836, he brought with him the notes & evidence which would form the basis of his landmark theory of evolution of species by a process of natural selection. Darwin`s theory, published as On the Origin of Species in 1859, is the basis of modern biology & the concept of biodiversity. It also sparked a fierce scientific, religious & philosophical debate which still continues today. This is the only paperback edition to include both The Origin of Species & The Voyage of the Beagle in one volume.