C. D. Broad distinguished Critical from Speculative philosophy in his "The Subject-matter of Philosophy, and its Relations to the special Sciences," in Introduction to Scientific Thought, 1923.
C. D. Broad tunnetaan siitä, että hän erotti kriittisen ja spekulatiivisen filosofian toisistaan (esimerkiksi "The Subject-matter of Philosophy, and its Relations to the special Sciences," teoksessa Introduction to Scientific Thought, 1923).