Volume 4 of this monumental English work, "The Treasury of Human Inheritance," edited by L. S. Penrose, M.D., is devoted to "Nervous Diseases and Muscular Dystrophies." Part 5 of this volume deals with myotonia congenita and dystrophia myotonica. There is a brief clinical sketch on both diseases. Among the topics discussed are age of onset of the disease, fertility in diseased families, cataract, inheritance and relationship between myotonia congenita and Thomsen's disease. The most valuable part of the work is the pedigrees in 223 cases of myotonia and paramyotonia. These pedigrees have been compiled with the greatest possible detail and thoroughness. This work is by far the most profound study of the genetic basis of myotonia published anywhere—at any time. For years to come, it will be the standard work on this subject. The chronologic bibliography is by no means complete. Many an important publication in English, French or German—