Part I. The imperative mood -- Prescriptive language -- Imperatives and logic -- Inference -- Decisions of principle -- Part II. 'Good' -- 'Naturalism' -- Meaning and criteria -- Description and evaluation -- Commending and choosing -- 'Good' in moral contexts -- Part III. 'Ought' -- 'Ought' and 'right' -- 'Ought' and imperatives -- An analytical model -- Index.