Obituaries.

The article presents obituaries of several people related scientific field. Frederick A. Bettelheim, distinguished university research professor of chemistry at Adeiphi University, Garden City, New York, and a guest scientist at the National Eye Institute of the National Institutes of Health, was died of a heart attack on February 17. He was 80. The other person Alfred E. Brown, retired director of scientific affairs for Celanese Corp., was died on March 12 at the age of 87. Irma Tuck-Weiss, professor emerita of biochemistry at New York University College of Dentistry and former head of admissions, was died on Feb. 19 at the age of 90.