Fatty acids and glycerides are the basic constituents of natural fats where they occur in the free form and as components of complex lipids. In addition to providing energy, fatty substances serve other metabolic and physiological functions. Current methodologies and specific findings in fatty acid and acylglyceral separation, determination of structure and chemical synthesis, tabulated results, and documentation are included. Specific topics covered include synthesis and analysis of stable isotope- and radioisotope-labeled fatty acids, stereospecific analyses and synthesis of glycerols, metabolic studies, composition of selected dietary fats, oils, margarines and butter, and fatty acid composition of glyceralipids of animal tissues