This book is about the concept of intelligence which derives virtually all of its significance from an occurrence use of mental conduct adverbs. The Concept of Intelligence provides an episodic rather than a dispositional analysis, while at the same time, agreeing that intelligence has 'outer criteria' of meaning. It reinforces the 'nature' as opposed to the 'nurture' side of the popular debate on intelligence by showing what the concept signifies in ordinary language, and so, dovetails with the controversial 'The Bell Curve.'