The tendency in medicine today is to devote more attention to the cause and prevention of pathologic states than to the therapeutic or other measures directed at their amelioration or cure. This tendency is peculiarly evident in the field of pediatrics, and nowhere in the modern literature on this branch of medicine is it more noticeably present than in articles dealing with rickets. While numerous communications have been published recently on series of babies in which attempts to prevent rickets have been made, no article having to do with private patients only or in which the study of each case was continued for as long as two years has come to our attention. Therefore, being anxious to determine the results of such a study and having sufficient clinical material available, we began the present work.
The children used in this study were selected as they presented themselves, no infant being