W. V. Quine was one of the most influential figures of twentieth-century American analytic philosophy. Although he wrote predominantly in English, in Brazil in 1942 he gave a series of lectures on logic and its philosophy in Portuguese, subsequently published as the book O Sentido da Nova Lógica. The book has never before been fully translated into English, and this volume is the first to make its content accessible to Anglophone philosophers. Quine would go on to develop revolutionary ideas about semantic holism and ontology, and this book provides a snapshot of his views on logic and language at a pivotal stage of his intellectual development. The volume also includes an essay on logic which Quine also published in Portuguese, together with an extensive historical-philosophical essay by Frederique Janssen-Lauret. The valuable and previously neglected works first translated in this volume will be essential for scholars of twentieth-century philosophy.

Walter Carnielli, Universidade Estadual de Campinas, Brazil
Walter Carnielli is Professor of Philosophy of Logic and Foundations of Mathematics at the State University of Campinas. His publications include books on computability theory, modal logics, paraconsistent logics and combinations of logics.

Frederique Janssen-Lauret, University of Manchester
Frederique Janssen-Lauret is a Lecturer in Philosophy at the University of Manchester. She is co-editor of Quine and His Place in History (2015), and her work on Quine, logic, and ontology has appeared in Synthese and The Monist.

William Pickering, Universidade Estadual de Campinas, Brazil
William Pickering is a translator and editor of academic works in the areas of logic and linguistics, and holds a Ph.D. in linguistics from the State University of Campinas. He has lectured and published on the applications of complex systems theory in linguistics.