This paper from the London Hospital Clinical Report 3, 259-262 (1866) is republished on account of its historical interest (see page 698). The editors are indebted to Dr J. H. Edwards, The Medical School, University of Birmingham who proposed republication and provided the copy.
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Langdon, J., Down, H. Observations on an ethnic classification of idiots. Heredity 21, 695–697 (1966). https://doi.org/10.1038/hdy.1966.69
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