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Freud's hypothesis on the basic form and functioning of the psychic apparatus, stemming from his theory of the structure of the dream as published in 1900, is very similar to the theory based on modern central nervous system physiology proposed by the British neurophysiologist, Adrian, in the first Ernest Jones lecture forty-six years later. Spiegel sees in that 'ability to generate the necessary mental voltage to throw an illuminating spark across poles of knowledge that are apparently unrelated' a proof of Freud's 'scientific imagination'. No one will question that this is an excellent example of the tremendous 'mental voltage' necessary for such an achievement, but we must remember that Freud was also a neurophysiologist. His deep interest in physiology and the structure of the central nervous system started his scientific career and continued from the Aphasia through to the Outline and the Mystic Writing Pad. The recently published Fliess letters show his constant, intensive endeavor to correlate his metapsychology with the physiology of the central nervous system. So, in a way, the spark was thrown from Freud, the founder of a new psychology, to Freud, the neurophysiologist.