This volume is the tenth in the series of medicine monographs issued by the Williams and Wilkins press. In his preface Dr. Lewellys F. Barker welcomes the contribution as one of the first American essays on the importance of the human individual aside from his disease. The book provides an excellent review of various studies on the subject of body types in addition to furnishing a statement of original observations by the authors, including anthropologic measurements. The essay includes also a critique of Kretschmer's views and conclusions. Unfortunately, the authors propose their own nomenclature as a substitute for much of Kretschmer's. This is likely to complicate the field still further. Unquestionably, much medical research in the future will deal with the relationship of body structure to mental and physical disorders. This monograph will aid the general reader in securing the fundamental facts and theories thus far proposed.