THURSDAY AFTERNOON, 2:00-5:30 Visiting Ladies—Auto Drive from Huckins Hotel, 2:30. 9. R. H. Johnson—A Standard Persistence Index and Coefficient of Persistence for Oil Well Decline Curves. (15 minutes) 10. R. H. Johnson and W. H. Osgood—The Mechanical Error in Con- structing Decline Curves on Logarithmic Paper. (10 minutes) 11. P. Reudemann—Some Graphic Methods of Appraising Oil Wells. (15 Minutes) 12. P. Reudemann and I. I. Gardescu—Estimating Reserves of Na- tural Gas Wells by Relationship of Production to Closed Pressure. (10 minutes) 13. F. A. Edson—Diamond Drilling for Production. (15 minutes) 14. R. D. Longyear—The Diamond Drill in Oil Exploration. (15 minutes) 15. Professional Ethics in Petroleum Geology. Discussion led by: E. B. Hopkins F. G. Clapp F. W. DeWolf R. A. Conkling K. C. Heald Max Ball Ralph Arnold C. M. Bennett C. T. Kirk C. W. Washburne D. W. Ohern Carl Beal W. A. Williams E. DeGolyer Wisconsin Luncheon, Skirvin Hotel, 6:00. THURSDAY EVENING Public Illustrated Lecture, Christian Church, Robinson and Tenth Streets, 7:30 16. Dr. Charles Schuchert—The General Geology of South America. Visiting Ladies—Line Party at Theatre, 8:45. SMOKER, 8:45, Chamber of Commerce, 321½ West Main Street. (Admission by ticket) FRIDAY MORNING, 9:00-12:00 17. F. L. Aurin and G. C. Clark—The Lower Permian of Northern Oklahoma. (20 minutes) 18. S. Powers—Age of the Oil-Bearing Sands of Southern Oklahoma. (10 minutes) 19. R. D. Reed—Some Suggestions in Regard to Pennsylvanian Paleogeography in the Henryetta District. (By Permission of the Oklahoma Geological Survey) (10 minutes) 20. J. V. Howell—Some Notes on the Lithology of the Pre-Permian Paleozoics of the Wichita Mountain Region, Oklahoma. (10 minutes. 21. L. English, A. Meyer, and R. Denison—Robberson Oil Field. 10 minutes) 22. C. T. Lupton, W. Lee, and B. R. Van Burgh—Oil Possibilities of Western Kansas. (20 minutes) 23. E. F. Shea—Water Conditions in the Urchel Pool, Kansas. (10 minutes)