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JAMA. 1930;95(25):1926-1927. doi:10.1001/jama.1930.02720250048022.
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Mentally Defective Persons in the Union of South Africa  The investigation of the incidence of mental defectiveness, initiated in 1915 by Dr. J. M. Moll of Pretoria, has been carried on with comparatively little enthusiasm, since his death, which robbed South Africa of an earnest investigator. Educated in the school of Winckler, whose first assistant he had been for many years, Moll came to this country ill with pulmonary phthisis. Like others, he found health in the uplands of the Karroo and accepted an assistantship at a government hospital for the insane, where for years he engaged in routine administrative work. In 1915 he started practice as a specialist in mental diseases at Johannesburg, and the Transvaal education department gave him a roving commission to investigate the extent of mental defectiveness in the schools. His first report, in 1917, showed that in the Transvaal schools there was an average of


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