Which 1943 C.S. Lewis book critiques modern education and moral relativism?

The Abolition of Man is C.S. Lewis’s 1943 book critiquing modern education and moral relativism.

The book developed from three lectures Lewis delivered at the University of Durham in February 1943. Across its three chapters, he argues that moral judgments are not merely expressions of personal feeling and defends what he calls the Tao, a term he uses for a cross-cultural body of basic moral principles. He also warns that attempts to reshape human nature through technological control could ultimately destroy what we mean by humanity.

Lewis was responding partly to educational theories that he believed treated value judgments as subjective emotions. The work is philosophical and argumentative rather than a conventional novel or devotional book. Its final chapter, “The Abolition of Man,” gives the volume its title and examines the consequences of mastering nature through power over human beings. The book is often discussed alongside Lewis’s critique of scientism.