Not so long ago the field of industrial medicine was limited to a few salaried physicians or to a small group of physicians in private practice who were more or less favored by the industrial concerns or the insurance carriers. However, since legislation has made it possible for the injured employee to have free choice of physician, the field of industrial medicine and surgery has been opened to the profession at large. As a result of this change, most physicians come in contact with industrial accidents and occupational diseases more frequently than heretofore. Many of the older occupational diseases are common and well known to all of us, but there are a few cases which we see only occasionally and some cases which we see rarely; with regard to these it becomes our duty as professional colleagues to acquaint one another with what we think is valuable.
My particular interest