PLANT AND ANIMAL SCIENCES BY PETER D. MOORE Department of Biology Kings College London, U.K. " Field experiments using catchments in Norway are providing a new approach to the understanding of acid rain. By the experimental addition of acids to a pristine catobment, soil changes can be monitored, and by protecting an acid site from further rain, the reversion of the process can be observed. R.F. Wright, E. Lotee, A. Serab, “Reversibility of acidification shown by whole-catchment experim

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