On the Origin of Species

The Origin made naturalism — the view that biological phenomena can be explained without invoking supernatural agency — the working assumption of the life sciences. It is the historical engine of philosophical naturalism in the second half of the nineteenth century onward.

"There is grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one." (Origin, closing paragraph)

Darwin's working method — inferring real causal mechanisms (variation, inheritance, differential reproduction) from observable patterns — is the paradigm of critical realism in scientific practice.

"I look at the geological record as a history of the world imperfectly kept... of which we possess the last volume alone." (Origin IX)

Darwinian evolution is process at its largest scale — species are not fixed essences but lineages in flux. Whitehead's process metaphysics absorbed this directly.

"What limit can be put to this power, acting during long ages and rigidly scrutinising the whole constitution, structure, and habits of each creature?" (Origin IV)

James, Dewey, and the pragmatists read the Origin as the model for a philosophy that takes inquiry as the self-correcting work of finite organisms adapted to their environments.

"The whole organism is so tied together that when slight variations in one part occur, and are accumulated through natural selection, other parts become modified." (Origin V)

Marx wanted to dedicate Capital to Darwin (a story sometimes misreported in detail but true in substance); Marx and Engels read the Origin as the natural-historical complement to the historical materialism of their own work.

"This preservation of favourable individual differences and variations, and the destruction of those which are injurious, I have called Natural Selection." (Origin IV)

Darwin himself moved from a moderate Anglicanism toward a deistic agnosticism over his life; the Origin's first-edition closing "originally breathed... by the Creator" (added in the second edition under pressure) is the residual deistic posture of the text.

"To my mind it accords better with what we know of the laws impressed on matter by the Creator, that the production and extinction of the past and present inhabitants of the world should have been due to secondary causes." (Origin XIV)