Lucas, George R., Jr.  "'Muddleheadedness' Versus 'Simplemindedness'--Comparisons of Whitehead and Russell."  Process Studies 17, no. 1 (Spring 1988): 26-39.

Abstract

The title of this article is drawn from Whitehead's famous introduction of Russell during the latter's William James lectures at Harvard in 1940.  This article focuses on similarities and mutual historical influence on the problems of causality, "causal efficacy," induction, and the method of "extensive abstraction."  I argue that there is both a strong continuity and logical consistency of development in Russell's positions, from the theory of descriptions to the theory of logical types and the relation of sense-data to physics in the early period, to his eventual adoption of a metaphysics of neutral event monism, similar to Whitehead's theory of "organic mechanism" in "Science and the Modern World".  [Abstract from The Philosopher's Index]