With the six volumes of the Writings edited by the Peirce Edition Project at Indiana University since 1982, the monumental work of Charles S. Peirce has finally received the care, respect, and love that it deserves. The sixth volume, object of attention of this review, represents a thorough selection and edition of Peirce's writings from 1886 to 1890.

Peirce discusses the nature and structure of propositions in several manuscripts written in the 1890’s and during the first decade of this century. In this paper I shall outline the main features of Peirce’s theory of the proposition, especially his account of what may be called indeterminate indices in propositions.