The Relation between Intelligence and Age of Walking in Normal and Feebleminded Children

quartile range of 7.56. For his normal group Mead found the mean age of walking to be 13.88 months. The median was 13.54 months, with a semi-interquartile range of 1.06. Additional information, varying from the results of empirical observation to the findings of statistical study, is available on the age at which normal children begin to walk. Holt and Howland 3 state,'' The first attempts at walking are commonly seen in the 12th or 13th month. The average age at which children walk freely has been, in our experience, the 14th or 15th month. Quite wide variations are seen in healthy children. ... We have known infants to walk at 10 months and many others not until 17 or 18 months, although showing no sign of disease." Demoor 4 says, "One can 1 Ireland, W. W. The mental affections of children, Philadelphia, P. Blakiston's Sons, 2d ed., 1900, p. 328. 2 Mead, C. D. The age of walking and talking in relation to general intelligence. Ped. Sem., 1913, 20, 460-484. 3 Holt, L. E., and Howland, J. The diseases of infancy and childhood New York, D. Appleton & Co., 8th ed., 1925. 4 Demoor, J. Die anormalen Kinder und ihre erzieliliche Behandlung in Haus und Schule, Altenburg, Oskar Bonde, 1901.