Chemical Society Reviews Vol 4 No 1 1975 Page PEDLER LECTURE Porphyrins and Related Ring Systems By A. W. Johnson 1 CENTENARYLECTURE Quadruple Bonds and other Mutiple Metal to Metal Bonds By F. A. Cotton 27 Kineticsof Reactions in Aqueous Mixtures By M. J. Blandamer and J. Burgess 55 HANDLING TOXIC CHEMICALS- ENVIRONMENTAL CONSIDERATIONS I Introducing a NewAgricultural Chemical By J. F. Newman 77 II Health Hazardsto Workers from Industrial Chemicals By A. Munn 82 IU Radioactive and Toxic Wastes :A Comparison of their Control and Disposal By A. W. Kenny 90 IV Environmental Protection in the Distribution of Hazardous Chemicals By A. E. Meadowcroft 99 Vibrational Infraredand Raman Spectroscopy in Inorganic Chemistry By I. R. Beattie 107 Olefin Metathesis and its Catalysis By R. J. Haines and G. J. Leigh 155 The Chemical Society London