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The author of this book is professor of human genetics at the University of Copenhagen and director of the Danish Institute for Human Genetics. Since much sound and valuable work has been done in Denmark in the line of human genetics, this book should be of interest to the American physician as representative of current thought on this subject in Scandinavia.
The first part of the book deals with general principles of genetics. Chapters on consanguinity, twinning, and sex determination are of definite medical interest. The second part deals with the difficulties which the geneticist encounters in medical matters and with his attempts to overcome them. Part three deals with normal hereditary factors in man. The inheritance of morphologic, physiologic, and psychic traits is discussed. The longest chapter is devoted to the genetics of blood groups and incompatibilities. About one-third of the book is devoted to hereditary diseases. Most disorders