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This is the third of a series of monographs from the Institute of Juvenile Research of Chicago. The first two monographs on "Brain Mechanisms and Intelligence" by Karl S. Lashley and "Delinquency Areas" by Clifford R. Shaw have already been reviewed. This investigation is based on data collected by the Institute. The book is divided into two parts: an analysis of the data taken from the Institute for Juvenile Research and a summary of the literature on this and closely related problems, for which Dr. Jenkins is chiefly responsible. The first part of the study is the work of both authors.
The conclusions are as follows: There appears to be a definite tendency for the intelligence quotient to increase progressively within families, from the first to the later born members. The first-born are apparently more frequently problem children than their brothers and sisters. The sex of the next older or
Order of Birth, Parent-Age, and Intelligence.. Arch NeurPsych. 1932;27(3):754-755. doi:10.1001/archneurpsyc.1932.02230150270017