In a brief introduction it is shown that even two thousand years ago the idea of considering the brain merely as a storehouse for images was held and discarded, and the realization expressed that to arrive at facts of sufficient solidarity to uphold theories one must go beyond introspection to anatomic, physiologic and clinical observation of the brain. A brief but adequate historical review brings the placement of psychic activity in the brain to date.
The work is divided into eight chapters: 1. The structure of the nerve cell and fiber; the nerve impulse, its nature and action in cell, fiber and brain. 2. The phylogenetic development of the nervous system. Subheads: stage of appearance of, general irritability, of specialized receptors, of reflexes, of intersegmental reflexes, of suprasegmental neurons. The results of suprathalamic and infrathalamic decerebration in fish, amphibians, reptiles, birds and mammalians. The complexity of structure and conduct in