This monograph is interesting and instructive. The subject is well presented and in proper sequence. It emphasizes congenital defects of the extremities. The illustrations are well chosen and well executed. There are many family charts given. The bibliography is complete so far as the German literature is concerned, but other European writers are scarcely mentioned. Almost no American writers are referred to, and one is surprised to note the omission of such names as Legg, Freiberg and Osgood in the discussion of conditions originally described by these men.