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Emily Elizabeth Constance Jones (1848-1922) was an English logician and contemporary of Bertrand Russell, as well as Mistress of Girton College, Cambridge. In this book, originally published in 1911, she argues for the existence of another fundamental law of thought to join the Law of Contradiction and the Law of Excluded Middle: the Law of Significant Assertion. This book will be of value to anyone with an interest in logic or in Jones' work.

One of the most influential of the Victorian philosophers, Henry Sidgwick (1838-1900) also made important contributions to fields such as economics, political theory, and classics. An active champion of higher education for women, he founded Cambridge's Newnham College in 1871. He attended Rugby School and then Trinity College, Cambridge, where he remained his whole career. In 1859 he took up a lectureship in classics, and held this post for ten years. In 1869, he moved to a lectureship in moral philosophy, the subject where he left his greatest mark. Published posthumously in 1902, this work is Sidgwick's expository critique of the leading schools of thought that had emerged to rival his philosophy of utilitarianism, which he had presented previously in his masterpiece The Methods of Ethics (also reissued in this series).