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Writers who would formulate and codify, usually begin by tearing down existing classifications, showing the uselessness of the procedure as a whole, then analyze their material and erect a system of their own, which is often no better than the systems they have derided. Finally, they reach out into the realms of classics, poetry, religion, music and art for verification. The authors of this little book run true to type, and their only deviation from the standard is the unusually small material they have to work with, consisting of only sixty-five persons. To be sure, these persons were studied in detail; for example, fifty-three direct measurements were made and thirty-seven different indexes were calculated. With their frequency distribution curves, however, they cannot expect to bring out small variations indicating bimodal or trimodal curves. The probable errors in the selection of persons must be extremely high.
On the subject of indexes
The Significance of the Physical Constitution in Mental Disease.. Arch NeurPsych. 1927;18(4):667-668. doi:10.1001/archneurpsyc.1927.02210040174018