Dear subscribers, What is this "ring test"? Hal Dr. Haraldur R. Karlsson Assistant Professor Department of Geosciences and Department of Chemistry and Biochemistry (Joint) Mailing Address: Department of Geosciences Box 41053,Texas Tech University Lubbock, TX 79409 USA Phones - (806)-742-3130 Office (806)-742-3112 Stable Isotope Laboratory Fax - (806)-742-0100 e-mail: [log in to unmask] world-wide-web: http://www.ttu.edu/~geosc/