These nightmare images are very frequently purely mechanical: as of falling terribly downwards, or being enclosed in vaults. And such images are pure physical transcripts. The image of falling, of flying, of trying to run and not being able to lift the feet, of having to creep through terribly small passages, these are direct transcripts from the physical phenomena of circulation and digestion. It is the directly transcribed image of the heart which, impeded in its action by the gases of indigestion, is switched out of its established circuit of earth-polarity, and is as if suspended over a void, or plunging into a void: step by step, falling downstairs, maybe, according to the strangulation of the heart beats. The same paralytic inability to lift the feet when one needs to run, in a dream, comes directly from the same impeded action of the heart, which is