PRACTICALadvances in ferrous analytical chemistry result from a correlation of available information with experience in selecting the most likely approach to solution of a specific problem. Frequently these advances are made under the compulsion of need for new or better data on experimental operations or new experimental alloys, and the chemist utilizes the store of basic information in the literature along with new reagents and tools as a basis for devising the method best suited to his requirements and the working facilities at his disposal. BASIC INFORMATION