The importance to the practitioner of a practical knowledge of joint diseases in children is becoming generally recognized. A sign-post of the times is the making of the orthopedic course obligatory to the medical students of Harvard University. The majority of orthopedic cases, and the most important ones, are met with in children. In recent years it is rare to see incurable cases that formerly were common, the cases that exemplify the terrible pathologic conditions that can be produced by tubercular joints, untreated or badly treated. And this is so because these diseases are recognized in their incipiency, and in every large city there are ways and means established that bring the proper treatment of such cases within the reach of the poor. This general leavening of the profession, as it may be termed, with orthopedic knowledge, is the work, in our country, of Henry G. Davis, Lewis A. Sayre,