Contents-: Introductory; The Behavior of the Lower Animals; Behavior of Insects; Behavior of the Vertebrates; The Instincts of the Mammals and of Man; Habit and Intelligence in Animals; Behavior of the Natural Man; Perceptual Thinking; Attention and Interest; Imagining-Anticipating-Recollecting; Emotion; The Derived Emotions; Disposition, Temper, Temperament, and Moods; Belief and Doubt; Growth of Mental Structure: The Development of Cognitive Structure or Intellect; Reasoning and the System of Beliefs; Growth of Mental Structure. The Development of Sentiments, The Organization of Character.