AbstractFree Radicals and Oxidation Phenomena in Biological Systems, Marcel Roberfroid and Pedro Buc Calderon. Dekker, New York, 1995, ix + 272 pages. $115.00.Biotransformations, Vol. 6: A Survey of the Biotransformations of Drugs and Chemicals in Animals, D. R. Hawkins, Editor. Royal Society of Chemistry, Letchworth, U.K., xxxii + 412 pages, 1994.£130.00. Available from CRC Press, Inc., Boca Raton, FL (USA, Canada, Mexico); D. A. Books and Journals, Mitcham, Australia (Australia, New Zealand, Papua New Guinea).