PRINCIPIA MATHEMATICA
Reading edition
BY
ALFRED NORTH WHITEHEAD, Sc.D., F.R.S.
Fellow and late Lecturer of Trinity College, Cambridge
AND
BERTRAND RUSSELL, M.A., F.R.S.
Lecturer and late Fellow of Trinity College, Cambridge
VOLUME II
Cambridge at the University Press 1912
Cambridge: PRINTED BY JOHN CLAY, M.A. AT THE UNIVERSITY PRESS