The class referred in this paper was composed of retarded boys from the public schools of Chicago, who were brought together under the management of the School of Education of the University of Chicago, partly because there was no other school which they could go and partly serve as material for investigation in prevocational education. The ages of the boys ranged from fourteen seventeen years. None of them had completed the eighth grade. The curriculum which was planned for the boys was as follows: in the morning, from nine until twelve o'clock, they worked in the machine shop; in the afternoon, they were engaged in the regular classroom work--arithmetic, history, English, general science, and mechanical drawing. For the purpose of understanding the boys better, each was given a careful examination in the Psychopathic Laboratory, under the direction of Dr. H. C. Stevens. The Woolley tests were used as a part of this examination, being given by the writer and Mr. E. B. Thomas. This article is a report of the results of these tests. Prevocational education is described by Professor F. N. Leavitt as having a double purpose: (i) to improve the courses of study in the elementary school, especially for those children who have not worked successfully under the prevailing methods found therein; and (2) to save for this education [in the higher schools] a much larger proportion of the school population, while at the same time giving information about, and practice in, some industrial work.' Prevocational education attempts meet the pupil's needs by differentiating the courses in the upper grades, by reorganizing