Many years ago the writer published, with notes and additions, a translation of a short monograph on Sterility and Impotence by the late Professor Ultzmann, of Vienna, which has long been out of print.<br><br>The present little book is based mainly on what has been observed in practice during the last thirty years, and it is hardly necessary to say that it does not pretend to be exhaustive. But perhaps it may be of some use to the student who becomes a practitioner with little knowledge of matters which receive but scanty recognition in the medical schools of this country.