This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public.

The material on the subject originally intended to form the 2d volume was later developed into an independent work: Principia mathematica, by A.N. Whitehead and Bertrand Russell, in 3 volumes. "First published 1903. Second edition 1938."