 Emily Elizabeth Constance Jones (1848–1922), a contemporary of Bertrand Russell and G. E. Moore at Cambridge University, worked primarily in philosophical logic and ethics. Her most significant contribution to the former area is her application of the intension-extension distinction to singular terms, anticipating Frege’s related distinction between sense and reference and Russell’s pre-“On Denoting” distinction between meaning and denotation. Widely regarded as an authority on philosophical logic by figures as diverse as F. C. S. Schiller and G. F. Stout on the one hand and C. S. Peirce on the other, Jones appeared in published symposia alongside such eminent contemporaries as W. E. Johnson and Bernard Bosanquet and became, in 1896, the first woman to present a paper at the Cambridge Moral Sciences Club. Her major publication, A New Law of Thought and its Logical Bearings, published in 1911 by Cambridge University Press, contained an enthusiastic preface by Stout and was received favorably in Mind, where the reviewer, Schiller, remarked: “Miss Jones has made a great discovery.” In the same year, Russell delivered a paper to the Moral Sciences Club, subsequently published as “Knowledge by Acquaintance and Knowledge by Description”, responding to a critical paper by Jones, delivered to the same society some months earlier. In ethics, Jones was well known as a defender and expositor of the views of her teacher and mentor, Henry Sidgwick. (Sidgwick regarded Jones as one of his prize students.) Yet, despite the fact that she published numerous articles, a monograph and several textbooks (some going into multiple editions), and was a very visible member of the English philosophical community from the 1890s until her death in 1922, she is now almost entirely forgotten.