This book is the amplification of a paper, the subject of which was, "A Plea for Circumcision; or, the Dangers that Arise from the Prepuce," which was read at the meeting of the Southern California Medical Society, at Pasadena, in December, 1889. The material gathered for that paper was more than could be used in the ordinary limits of a society paper; it was gathered and ready for use, and this suggested its arrangement into book form. The subject of the paper was itself suggested by a long and personal observation of the changes made in man by circumcision. From the individual observation of cases, it was but natural to wish to enlarge the scope of our observation and comparison; this naturally led to a study of the physical characteristics of the only race that could practically be used for the purpose. This race is the Jewish race. On carefully studying into the subject, I plainly saw that much of their longevity could consistently be ascribed to their more practical humanitarianism, in caring for their poor, their sick, as well as in their generous provision for their unfortunate aged people. The social fabric of the Jewish family is also more calculated to promote long life, as, strangely as it may seem, family veneration and family love and attachment are far more strong and practical among this people than among Christians, this sentiment not being even as strong in the Christian races as it is in the Chinese or Japanese. It certainly forms as much of a part of the teachings of Christianity as it does of Judaism, Buddhism, or Confucianism, only Christians, as a mass, have practically forgotten it. The occupation followed by the Jews also in a certain degree favors longevity, and the influence on heredity induced by all these combined conditions goes for something. But it is not alone in the matter of simple longevity--although that implies considerable--that the Jewish race is found to be better situated. Actual observations show them to be exempt from many diseases which affect other races; so that it is not only that they recover more promptly, but that they are not, as a class, subjected to the loss of time by illness, or to the consequent sufferings due to illness or disease, in anything like or like ratio with other people. There is also a less tendency to criminality, debauchery, and intemperance in the race; this, again, can in a measure be ascribed to their family influence, which even in our day has not lost that patriarchal influence which tinges the home or family life in the Old Testament. Crimes against the person or property committed by Jews are rare. They likewise do not figure in either police courts or penitentiary records; they are not inmates of our poor-houses, but, what is also singular, they are never accused of many silly crimes, such as indecent exposures, assaults on young girls; nor do they figure in any such exposures as the one recently made by the _Pall Mall Gazette_.