The Roentgenographic Appraisement of Skeletal Differentiation1

Abstract

periods of the life span. We know, for example, that the auditory ossicles and labyrinth are fully matured at birth, that the eyeballs and brain have almost reached adult size by five years, that the thymus and tonsils are at their greatest development and activity in childhood. The list might be indefinitely extended although along such lines we should but make generalizations without that directness of evaluation to which the method of study lends itself. It has been our good fortune during the past eighteen years to assemble a collection of human skeletons from known individuals for each of which it has been possible to secure the necessary data for a comprehensive study of growth and maturation, and of age changes in the remainder of the life span so far as these are set forth in the bones. This series has now reached the comparatively large total of eighteen hundred individuals including more than two hundred children and young people. In addition the roentgenographic study of a test sample of over one thousand children gives us opportunity to check the observations made both by the X-ray and by dissection or maceration on our skeletons.

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