At the peak of its power during the 1920s, eugenists advocated forced sterilization and called for strict laws about who would be permitted to marry. Thought to be scientific and quite popular among progressives, eugenics had few critics among writers and scientists. The most vocal of them was the British journalist, G. K. Chesterton in this 1922 book, now back in print with additional appendices containing articles by his eugenic opponents. A must-read book for understanding the eugenic debate.