The Struggle of Parts

Wilhelm Roux's The Struggle of Parts is a pioneering 19th‑century work that extended evolutionary ideas to the cellular level, proposing that parts of organisms compete in a Darwinian manner.

Roux suggested that selection operates within bodies, shaping development and physiology, a concept that presaged later discoveries about somatic mutation and cellular competition.

Though limited by the scientific tools of his time, the book influenced later thinkers and has been revisited as modern molecular techniques confirm intra‑organismal selection.

Its historical importance lies in anticipating ideas now central to cancer biology, developmental mosaics, and cellular evolution.

Roux's work has been translated recently, renewing interest in his prescient insights.