Knowledge in the field of acidic deposition is expanding rapidly, and both ex- perts and non-experts are challenged to keep up with the latest information. We designed our assessment to include both the basic foundation needed by non- experts and the detailed information needed by experts. Our assessment in- cludes background information on acidic deposition (Chapter 1), an in-depth discussion of the nature of soil acidity and ecosystem H+ budgets (Chapter 2), and a summary of rates of deposition in the Southeastern U.S. (Chapter 3). A discussion of the nature of forest soils in the region...