This pamphlet is the outgrowth of an exhibit prepared for a meeting of the American Medical Association and follows the usual manner for presentation of exhibits. Almost every page contains an illustration which is well labeled. There are numerous diagrams, charts, tables and graphs. The data are presented briefly in outline form. There are many practical therapeutic and other clinical facts in these pages. The book should prove to be useful to busy practicing physicians as well as to others who may desire a concise presentation of the subject.