THE object of this study was to discover to what extent there was feeble mindedness among the children in the country schools of chosen districts of a county in Devon, England where there was reported to have been a great deal of inter-marriage due to isolation. The children were tested by Burt's Revision of Binet's Intelligence Tests and by a group of performance tests in order to have two tests of their intelligence. For a basis of comparison the children in an institution for the mentally defective were tested in the same manner. Their familiarity with the questions in the intelligence tests and training in certain types of performance were taken into consideration. The children in this institution were tested every year by the Stanford Revision of Binet, which is very similar to that of Burt's, and which gave them some advantage over the country children, none of whom had ever been tested before. Also these institution children have been receiving special training in drawing and handwork, and there is a possibility that this might raise their scores in the performance tests. After having considered the effect of these factors, the results were compared with those obtained from the country school in order to discover whether the country schools contained many children of the same low degree of intelligence that the government considered worthy of special institutional care under the Education Acts. Burt's revision of Binet's tests follows the original closely as far as the material is concerned, the only difference being in the assortment and age assignments. This was necessary as the Binet-age Assignments which had been based on tests given to French children were not wholly applicable to English children. For instance, many older normal children in London, when given the tests appeared to be defective, and many defective younger children had higher results than they merited. The changes in the material itself in the tests are very slight, and when there was any modification, both forms are given and the cause for the change. Burt himself says that the alterations are only made in order to carry out more completely the spirit of the original. He admits frankly that the version is not faultless, and that an entirely new series of scales must be constructed, but as this would demand a long time in research, he aims solely to give a version that adheres more closely to the original French authors than any other of the published forms. Burt's tests were given in the man-
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