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First published in 1987, this book examines the numerous interacting physical, chemical and biological processes which regulate the acidity of freshwaters. Natural acidification processes are considered first, the the effects of acidifying pollutant inputs from the atmosphere and of other human activities. The relative importance of the different processes is critically examined. Concepts incorporated are drawn from chemistry, physics, geology, hydrology, plant science and forestry, soil science, microbiology and meteorology. The authors have attempted to thread the relevant information...

Originator, innovator, activist and educator, Emeritus Professor Michael Edwards was central to the international evolution of art therapy. These previously unpublished papers are the most substantial written record of his thinking. Highly praised by leading figures in art psychotherapy, Professor Shaun McNiff wrote '...the ideas have wings that carry the reader inside to the marrow of art... The book will appeal to artists looking for a threshold into the arts in therapy'. Rejection of reductionism and fundamentalism made Edwards a champion of soul, a challenger of simple mindedness. Widely...