The three volumes on "The Melanotropic Peptides" are the outcome of a conference of the same name that was held in Tucson, Arizona, from October 11-12, 1986. The format of the three volumes provides a complete coverage of what is known about the Melanotropic Peptides. Volume I provides information on the source, synthesis, chemistry, mechanism of secretion, control of secretion, and the circulation and metabolism of the melanotropic peptides.