Parametric studies were continued during this quarter to investigate gasifiers with inlet reservoir devolatilization and 100% oxygen feed for gasifier lengths of 50 cm, 100 cm, and 200 cm. The effect of pulsations on the mass flow rates of product gases leaving the gasifier was investigated. Pulsations of moderate amplitude increased significantly the production rates of the fuel gases CO and H/sub 2/. The first test runs of the experimental gasifier with methane fuel were successfully completed. Later experimental runs were conducted in which pulsations were generated spontaneously.