Sperm morphology and recurrent abortion**Supported by grants HD00815 and HD23547 from the National Institutes of Health, Bethesda, Maryland, and the Fearing Research Laboratory Endowment, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts.††Presented in part at the 48th Annual Meeting, The American Fertility Society, New Orleans, Louisiana, October 31 to November 5, 1992.