This volume provides a historical introduction in the writing of the manuscript. Theory of Knowledge: The 1913 Manuscript is the only book-length work on epistemology that Russell left unpublished in its original form, and its publication here is an important addition to knowledge of Russell's thought.

Theory of Knowledge gives us a picture of one of the great minds of the twentieth century at work. It is possible to see the unsolved problems left without disguise or evasion. Historically, it is invaluable to our understanding of both Russell's own thought and his relationship with Wittgenstein.

Covering the topics of God, immortality, conscience and immortality, this volume presents a selection of essays of the first decade of Russell as an independent thinker. It includes his graduate essays, adolescent writings and ideas on ethics, Bacon, Hobbes and DesCartes, psychology and politics.

This volume collects together all of Russell's philosophical papers inspired by his work with Whitehead on 'Principia Mathematica'.

This volume contains Russell's reviews of and introductions to other philosophical works including his famous introduction to Wittgenstein's Tractatus Logico-Philosophicus.

This volume of Bertrand Russell's Collected Papers finds Russell focused on writing Principia Mathematica during 1905–08. Eight previously unpublished papers shed light on his different versions of a substitutional theory of logic, with its elimination of classes and relations, during 1905-06. A recurring issue for him was whether a type hierarchy had to be part of a substitutional theory. In mid-1907 he began writing up the final version of Principia, now using a ramified theory of types, and eleven unpublished drafts from 1907-08 deal with this. Numerous letters show his thoughts on the process. The volume's 80-page introduction covers the evolution of his logic from 1896 until 1909, when volume I of Principia went to the printer.