Charles Darwin: “Natural Selection” is a manuscript, in which he presented his theory of natural selection and its role in biological evolution.
Darwin regarded Natural Selection as his main work, while On the Origin of Species was written for a wider audience. He always intended to finish Natural Selection, but because of frail health, the publicity and work involved in publishing six editions of On the Origin of Species, plus other research and publications, he never got around to finish it.
Natural Selection was transcribed after Darwin’s death, and first published in 1975.
“Survival of the fittest” is a phrase…