The integument plays an important role in the survival of meta­ zoans by separating and protecting them from a hostile environment. Its function ranges from protection against injury and in­ fection, participation in the regulation of body temperature and water balance, to respiratory activity, monitoring of the environment and production of signals related to behaviour. All these result from specific structural, biochemical and physiological properties of intra-and extracellular components of the integu­ ment. Thus its characterization can be best accomplished by a multidisciplinary approach with authors specialized in different fields of science. This multi-author book, in two volumes, provides an up-to­ date survey of the literature. The first volume deals with the integument of invertebrates, the second with that of vertebrates, both organized primarily on a phylum basis. As the level of knowledge on the integument of phyla differs considerably, the information provided is correspondingly either limited or con­ densed. For some of the smaller groups of invertebrates little information is available, as often only a few electron micrographs are to be found in the literature ; on the other hand, from the large body of knowledge existing for vertebrates, particularly for mammals, no complete overview can be provided, but publications giving access to further information have been reviewed critically.