1. The Chemistry of Sulfur.- 2. The Reduction of Sulfate and the Oxidation of Sulfide.- 3. The Metabolism and Functions of Methionine.- 4. Taurine and the Oxidative Metabolism of Cysteine.- 5. Thiols, Disulfides, and Thioesters.- 6. Thioethers.- 7. Sulfates.- 8. Inherited Disorders of Sulfur Metabolism.- 9. Sulfur and the Metabolism of Xenobiotics.