Cambridge: University Press, 1925. FIRST EDITION. Errata leaf in each volume. Original blue cloth, exteriors faintly rubbed and spine of first volume a bit shaken, still an excellent set in an open-end box. Volumes 1 and 2 with Whitehead's presentation note on the first blank, "S.M.W. from A.N.W." and the bookplate of South-west Essex Technical College and School of Art Library.