Testicular Biopsy: Sperm Antibodies**Supported in part by National Institutes of Health Vasectomy Contract N01-HD3-2759 from the Center for Population Research, National Institutes of Health. The opinions or assertions contained herein are the private views of the authors and are not to be construed as official or as reflecting the views of the Department of the Army or Department of Defense.††Presented at the Thirty-First Annual Meeting of The American Fertility Society, April 3 to 5, 1975, Los Angeles, Calif.