May 16, 1978 (vol. 88, iss. 10) • Page Image 11
…Rare, well-done .. . NEW YORK (AP) - Hamburger meat cooked too long at temperatures above 300 degrees Fahrenheit may produce cancer-causing substances, but the extent of the risk is not yet known, a biologist said yesterday. Dr. Barry Commoner, of Washington University's Center for the Biology of Natural Substances in St. Louis,- said the composition of the substances has not been determined and, until that is done, tests on animals cannot be...…