It is the purpose of this book to facilitate the recognition of various forms of mental deficiencies in children. The possibility of improvement by training is given much consideration. Types of the various degrees of deficiency are given. A series of photographs illustrate the various types. These are either chosen none too well or perhaps reproduced none too well. A brief sketch goes with each photograph. These sketches contain too much of the so-called "human interest stuff." From the standpoint of the physician they could be much improved.