The fifty-eighth meetirg of the Advisory Committee for Biology and Medicine was held at the Brookhaven National Laboratory on November 16 and 17, 1956. The meeting proper held on September 22 was preceded on the 21st by a presentation of the Brookhaven scientific programs in biology, medicine, instrumentation and health physics. The details of the Brookhaven program appear in Appendix A. Abstracts of the papers presented and important comments or questions raised by Committee memoers are on file. The Laboratory Director, Dr. Leland J. Haworth presented an after-dinner talk on the subject of cooperation in research as it is applied by the Brookhaven National Laboratory and its associates,