The most rigorous tests of Uri Geller's unusual ablity were undertaken, during a five-week period in November-December 1972, at the Stanford Research Institute at Menlo Park, California. The institute, which is not affiliated with Stanford University, engages in research and in consulting and advisory services for commercial and industrial organizations throughout the world, as well as for goverment agencies. In 1973, according to the institute's annual report, 41% of its revenue came from work for the U.S. Department of Defence; 34% from non-defence-related goverment contracts in such areas as health, enviroment, and education; 23% from commercial research; and 2% from "other" research. The following report, based largely on material issued by the Stanford institute, describes the scope of the Geller research, its procedures, and its tentative results.