Excerpt from The Pedagogical Seminary, Vol. 29: A Quarterly International Record of Educational Literature Institutions and Progress, 1922

The data here discussed consist of radiographs of the hands and wrists of 402 Minneapolis and St. Paul school children, varying in age from 5¿ to 11¿ years, inclusive. A record of the number of permanent teeth was also made, except in the case of the children constituting the 10¿-year group. Individual intelligence examinations by the Kuhlmann 1917 revision of the Binet tests were given to all the children. The data obtained in this investigation, which is regarded simply as a preliminary survey, permit of the calculation of correlations only in the case of the 7¿-year and 10¿-year children, because at these ages alone did the children used constitute sufficiently large or sufficiently unselected groups. These two age groups, numbering about one hundred each, were unselected in the sense that each of them included all the children of the particular age in question in some one school building, with the exception of a few children, who, for one reason or another, were absent from school on the days when children were taken to the hospital where the radiographs were made.

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