To the reports of experimental studies are added two new essays dealing with the general laws of human and animal learning. JANUARY, 1911. CONTENTS PAGE THE STUDY OF CONSCIOUSNESS AND THE STUDY OF BEHAVIOR 1 ANIMAL INTELLIGENCE 20 Introduction 20 Description of Apparatus 29 Experiments with Cats 35 Experiments with Dogs 56 Experiments with Chicks 61 Reasoning or Inference 67 Imitation 76 In Chicks 81 In Cats 85 In Dogs 92 The Mental Fact in Association 98 Association by Similarity and the Formation of Concepts 116 Criticism of Previous Theories 125 Delicacy of Association 128 Complexity of Associations 132 Number of Associations 135 Permanence of Associations 138 Inhibition of Instincts by Habit 142 Attention 144 The Social Consciousness of Animals 146 Interaction 147 Applications to Pedagogy, Anthropology, etc. 149 Conclusion 153 THE INSTINCTIVE REACTIONS OF YOUNG CHICKS 156 A NOTE ON THE PSYCHOLOGY OF FISHES 169 THE MENTAL LIFE OF THE MONKEYS 172 Introduction 173 Apparatus 177 Learning without Tuition 182 Tests with Mechanisms 184 Tests with Signals 195 Experiments on the Influence of Tuition 209 Introduction 209 Imitation of Human Beings 211