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
