
While I was writing Principia Mathematica I felt justified in living on inherited money, though I did not feel justified in keeping an additional sum of capital that I inherited from my grandmother. I gave away this sum in its entirety, some to the University of Cambridge, some to Newnham College, and the rest to various educational objects.
Source:The Autobiography of Bertrand Russell, v.2 chap. 2:Russia, 1968
More info.:http://russell-j.com/beginner/AB22-010.HTM