The results of artificial insemination with the husband's semen (aih) are reported on 114 patients whose ages ranged from 22 to 43 years. Seven patients used self-insemination; two of these had three pregnancies, and, of the remaining five, two conceived by doctorinsemination. Excluding the self-inseminations, a total of 880 inseminations were made and resulted in twenty pregnancies, i.e. an average of forty-four inseminations per pregnancy. But, fifty-one patients gave up after they had had six or fewer inseminations and seventy-five (including those still undergoing insemination but excluding those who had conceived) had fewer than twelve inseminations. The actual number of inseminations needed to produce a pregnancy varied from one (three cases) to forty-two (one case) and more than 50% of conceptions occurred with less than six inseminations. The successful inseminations were intra-uterine in four cases and intra-cervical in sixteen. Seventyfive per cent of the successful inseminations were made between cycle Days 10 and 15, the mean cycle lengths in these cases ranging between 25·8±3·1 and 32·4±2·5 days.
Ten of the patients in the series conceived without aih. Three of these had previously had ai pregnancies, the other seven having failed to conceive by aih.