The Third Annual Symposium on Health Sciences attracted over 400 scientists from 15 countries. It was held at the National Academy of Sciences in Washington, D.C. The theme of this meeting was "Thymic Hormones and Lymphokines: Basic Chem- istry and Clinical Applications." The meeting emphasized the state of the art with regard to chemistry, mech- anism of action, and clinical applications of thymic hormones and lymphokines. In addition to the five...