Using flame stabilization and direct sampling techniques developed under this contract, the combustion and inhibition processes in coal dust-air flames was studied. Premixed, laminar, flat flames of 10 to 20u Pittsburgh seam coal, stabilized on a 6.3-Cm burner, were probed for both gaseous and particulate species. The emphasis was on high spatial resolution sampling of the ignition and primary reaction zone. Results are presented involving five kinds of profiles through rich coal-air flames as follows: (1) direct, molecular beam mass spectrometry of o2, n2, co2, h2o, nitrogen, and sulfur-containing species; (2) gas chromatography of collected samples for o2, n2, CO, co2, h2, ch4, and c2 hydrocarbons; (3) proximate analysis of coal and char samples collected in bulk; (4) scanning electron microscopic analysis of directly impacted coal and char particles; and (5) fine wire thermocouple temperature measurements. Also included are observations on the quenching behavior of Pittsburgh seam coal-air flames and of the gaseous potassium- and phosphorus-containing species evaporating from dry- powder inhibitors in the reaction zone of ch4 air flames. Suggestions for future research are made.