1. Comparison for Fish Bioconcentration Models J. Devillers, D. Domine, S Bintein and W. Karcher 2. QSARs in Aquatic Toxicology - a Mechanism of Action Approach Comparing Toxic Potency to Pimephales promelas, Tetrahymena pyriformis and Vibrio fischeri T.W. Schultz, G.D. Sinks and A.P. Bearden 3. Comparative QSAR and 3D-QSAR Analysis of the Mutagenicity of Nitroaromatic Compounds R.L. Compadre, C. Byrd and C.M. Compadre 4. Some Novel Approaches to Modelling Transdermal Penetration and Reactivity with epidermal proteins P.S. Magee 5. Contribution of Structure-Odour Relationships to the Elucidation of the Origin of Musk Fragrance Activity D. Zakarya and M. Chastrette 6. QSAR Analysis of Protoporphyrinogen Oxidase Inhibitors K.N. Reddy, F.E. Dayan and S.O. Duke 7. Comparative QSAR of the Inhibition of Dihydrofolate Reductase C.D. Selassie and T.E. Klein 8. A Generalised Approach to Comparative QSAR C. Hansch, H. Gao and D. Hoekman. Bintein, Ministry of the Environment, France, C. Byrd, University of Arkansas for Medical Sciences, USA, M. Chastrette, University of Lyon, France, C.M. Compadre, University of Arkansas for Medical Sciences, USA, R.L. Compadre, University of Arkansas for Medical Sciences, USA, F.E. Dayan, University of Mississippi, USA, J. Devillers, CTIS, France, D. Domine, CTIS, France, S.O. Duke, University of Mississippi, USA, H. Gao, Pomana College, USA, C. Hansch, Pomana College, USA, D. Hoekman, Pomana College, USA, W. Karcher, Ispra Establishment, Italy, T.E. Klein, University of California, USA, P.S. Magee, UCSF School of Medicine, USA, K.N. Reddy, Southern Weed Science Laboratory, USA, T.W. Schultz, University of Tennessee, USA, C.D. Selassie, Pomana College, USA, G.D. Sinks, University of Tennessee, USA, D. Zakarya, Faculty of Science and Technology, Morocco.