C. Bell and N. Haites, The Peripheral Neuropathies and Their Molecular Genetics. M.A. Brown, Tumor Suppressor Genes and Human Cancer. J.F.Y. Brookfield, Genetic Redundancy. P. Hutter, Genetics of HybridInviability in Drosophila. D.J. Westenberg and M.L. Guerinot, Regulation of Bacterial Gene Expression. D.D. Perkins, Chromosomes Rearrangements in Neurospora and Other Filamentous Fungi. Subject Index.