Gates's "Heredity in Man," published in 1929, may be considered the forerunner of the present publication. However, the new work, "Human Genetics," includes so many additional chapters and improvements that it may be looked on as an entirely new attempt to compile the present day knowledge of human genetics. An introductory chapter on "General Principles of Heredity in Man" acquaints the reader with the terminology used by geneticists and with the principal laws of inheritance. Physicians who do not read genetic publications regularly will find in this chapter explanations for such terms as "penetrance," "normal overlaps," "expressivity," "pleiotropy," "anticipation," "homochronous heredity" and many others. Two additional chapters of a general character deal with human cytology and with linkage. The inheritance of some normal traits is discussed in four chapters, which deal with color of the eyes and of the hair, blood groups, stature and size and with such anthropologic characters