This book is a reissue of a long-unavailable work by the English philosopher and educator Henry Sidgwick (1838-1900). Published in 1898, it collects nine essays, in which Sidgwick discusses such issues as when public officials might be justified in lying or breaking promises, whether scientists may legitimately inflict suffering on animals for research purposes, along with a score of other problems in practical ethics. The noted ethicist Sissela Bok has contributed a Foreword to this reissue, arguing for the book's continuing relevance to contemporary debates.