Abstract
In the early biographical studies of babies, reports are given of the age at which certain motor abilities, such as sitting, standing, etc., occurred in the individual babies studied. The recent experimental studies of motor development, carried out on large groups of babies as contrasted with single cases used for the biographical studies, have shown slightly different average ages for the appearance of different forms of motor coordination. It therefore seemed to the writers that it would be interesting to compare the two types of studies to see how they agree to differ.
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