The dualist doctrine establishes a between mind and body. At the language level, the mental properties are logical negations (in the Aristotelian sense) of the physical properties. So they belong, in accordance with the concept of category, to the same logical types, given that the expressions that are used for the descriptions of mental events are always mere negatives of the expressions used for the descriptions of material events. Ryle then says that such use implies a 'categorical mistake' for the descriptions of mental events that do not properly belong to the categories used for describing the corporeal events. Hence, 'mind' and 'matter' cannot be the polar opposites that Dualism suggests. Ryle writes that this would be comparable to claiming that "She came home in floods of tears" and "She came home in a sedan chair" (from the sentence "Miss Bolo came home in a flood of tears and a sedan chair," a zeugmatic sentence from Dickens) to be polar opposites. Such mistakes are, from the Rylean standpoint, the dogma of the mental ghost in the corporeal machine. Then, dualist doctrines are mythic in an analytical sense.