48. The Doctrine of Representative Perception. 49. The Step to Idealism. 50. The Revolt of "Common Sense." 51. The Critical Philosophy.

CHAPTER XIII
REALISM AND IDEALISM

52. Realism. 53. Idealism.

CHAPTER XIV
MONISM AND DUALISM

54. The Meaning of the Words. 55. Materialism. 56. Spiritualism. 57. The Doctrine of the One Substance. 58. Dualism. 59. Singularism and Pluralism.

CHAPTER XV
RATIONALISM, EMPIRICISM, CRITICISM, AND CRITICAL EMPIRICISM

60. Rationalism. 61. Empiricism. 62. Criticism. 63. Critical Empiricism. 64. Pragmatism.