Principia mathematica, vol. 2 (of 3), by Alfred North Whitehead 78255 [Author: Alfred North Whitehead] [Author: Bertrand Russell] [Link: https://www.gutenberg.org/ebooks/78255] note: link will be active within two hours of posting. Thanks to Richard Tonsing, Laura Natal and the Online Distributed Proofreading Team at https://www.pgdp.net (This book was produced from images made available by the HathiTrust Digital Library.) In memoriam of Greg Newby. Regards, Robert