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The second edition of this work has filled a want in an interesting way. The author begins with a study of the motor functions of the ameba and its responses to its environment, and then traces some of the functions in unicellular and multicellular organisms and the gradual development of affector and effector elements, their differentiation into nervous tissues, and the final accumulation of sensory and sensient cells with the development of consciousness, all envisaged from the physiologic point of view.
The author makes a naive apology to the religious-minded for his practical denial of the spiritual and soul features of the old psychologists. In nervous manifestations he adheres to the argument for synaptical contacts and withdrawals, and in this way explains various organic and inorganic nervous disorders. He believes in the electrical character of nerve transmission, and after developing the subject of the field of consciousness, the rôle of