Criteria of instinct,

92, 97, 138

Criticism,

499-500, 503, 505, 508-512, 547

Crying,

144

Curiosity,

154-157, 181, 244, 258

Curve,

of distribution, 280;
of forgetting, 350, 390;
of learning or practice, 307, 316, 321, 325, 390