Two experiments tested a theory of information processing in metaphoric comprehension and appreciation. According to this theory, certain kinds of metaphors are based upon underlying analogies, and the processing components used to interpret these metaphors are highly similar to those used in the interpretation of analogies. A critical difference in the two kinds of information processing, however, is in the interaction of tenor and vehicle in the interpretation of metaphor; a comparable interaction does not occur in the interpretation of the domain (first half) and range (second half) of an analogy. In the first experiment, modeling of latencies for comprehending analogies and corresponding metaphors showed that information processing was similar, but not identical, in the two tasks. In the second experiment, comparisons between different metaphoric forms showed that the proposed theory could account for ratings of the aptness and comprehensibility of various metaphors, and that making more clear the identities of the terms of the analogy underlying a metaphor and the nature of the interaction between tenor and vehicle increased both the aptness and the comprehensibility of a metaphor. (Author)