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The German original of this work is entitled "Menschliche Erblichkeitslehre," and a third edition was published in Munich in 1927. The translation was made from that edition by Eden and Cedar Paul, but with supplements and corrections supplied by the authors during the preparation of the English version. This is an important work, previous editions having been published years ago and a second edition having been published in 1923.
Some additions to previous editions are presented in this volume in certain sections. The first section, "Sketch of the General Theory of Variation and Heredity," is by Dr. Erwin Baur. The second section, "Racial Differences in Mankind," is by Dr. Eugen Fischer. The last three sections "Morbific Heredity Factors"; "Methodology," and "The Inheritance of Intellectual Gifts," are all by Dr. Fritz Lenz. The work is too involved and too detailed to be reviewed specifically. It is sufficient to say that it