ILLUSTRATIONS. 



Page. 



FIG. 1. Experimental retort 10 



2. Diagram showing method of cutting up material 12 



3. Boiling-point and specific-gravity curves for oil from run 21 23 



4. Boiling-point and specific-gravity curves for oil from run 23 24 



5. Curve showing fractionation of oil during run 16 27 



6. Curve showing fractionation of oil during run 20 28 



7. Curve showing fractionation of oil during run 7 - 30 



6 



