This volume of Bertrand Russell''s Collected Papersfinds Russell focused on writingPrincipia Mathematicaduring 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 Eight previously unpublished papers shed light on his different versions of a substitutional theory of logic, with its elimination of classes and relations, during 1905-06.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 In mid-1907 he began writing up the final version ofPrincipia, now using a ramified theory of types, and eleven unpublished drafts from 1907-08 deal with this.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 ofPrincipiawent to the printer.
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