Chapter Vii of This Study, P. 91 Ff.

Studies in Logical Theory, p. 4.

Ibid., p. 2.

"Beliefs and Existences," The Influence of Darwin on Philosophy, p. 172 f.

The Philosophical Radicals, p. 297. The essay in which it occurs, "Philosophy as a Criticism of Categories," was first published in 1883, in the volume Essays on Philosophical Criticism.

"Realism and Metaphysics," Philosophical Review, Vol. XXVI, 1917, p. 8.