I. Proper and common names-Importance of common or general names-They are the first terms of couples-The second terms of such couples are general and abstract characters.
III. How, in spite of this, it differs from the corresponding sensation- The illusion accompanying it is speedily rectified-The image inva-
riably comprises an illusion of greater or less duration-Dugald Stewart's Law-Instance of an American preacher-Testimony of M. Flaubert-Instance of an English painter-Evidence of a chess-player-Observations of Goethe and of M. Maury-Volun- tary hallucinations-Various circumstances under which the image becomes hallucinatory-These extreme cases are evidence as to the normal state-In the normal state, the illusion is at once destroyed -It is destroyed by the presence of an antagonist or reductive.