Abstract: This collection of essays, written between 1957 and 1977, contains discussions of the moral philosophy of David Hume, Immanuel Kant, Friedrich Nietzsche, and some modern philosophers. It presents virtues and vices rather than rights and duties as the central concepts in moral philosophy. Throughout, the author rejects contemporary anti- naturalistic moral philosophies such as emotivism and prescriptivism, but defends the view that moral judgements may be hypothetical rather than (as Kant thought) categorical imperatives. The author also applies her moral philosophy to the current debates on euthanasia and abortion, the latter discussed in relation to the doctrine of the double effect. She argues against the suggestion, on the part of A. J. Ayer and others, that free will actually requires determinism. In a final essay, she asks whether the concept of moral approval can be understood except against a particular background of social practices.

Keywords: abortion, euthanasia, free will, David Hume, Immanuel Kant, moral judgements, Friedrich Nietzsche, society, vices, virtues, A. J. Ayer