For the purpose of this study, metaphor is defined as a comparison which is not literally true. Such a comparison may be explicitly stated, as in a simile, or it may merely be implied, as in synecdoche, metonymy, hyperbole, or personification. In each case the primary or tenor image, a person, place, object, or idea in the novel, is compared to a secondary or vehicle image, a person, place, object, or idea not literally the same as the tenor image. The body of data on which this investigation is based consists of over fourteen thousand metaphors taken from Melville's nine novels. Each of these metaphors has been classified on the basis of its vehicle image. There are eight general categories, and tables are provided which show the number of metaphors in each category in each novel and the frequency with which the metaphors in each category occur in each novel. Overall, his metaphors suggest that Melville's vision of life was more often pessimistic than optimistic. They also reveal his growth as a writer. In the later novels, metaphors generally are more original than those in the early novels and are more skillfully related to his major themes.