Of course it would not occur to us to doubt the importance, experimentally demonstrated, of external sensory stimuli during sleep, but we have given this material the same place relative to the dream-wish as we have the remnants of thought left over from the work of the day. We do not need to dispute that the dream interprets the objective sensory stimulus as if it were an illusion; but where the authorities left the motive for this interpretation uncertain, we have put it in.