A COMPARISON OF THE EVOLUTION OF CARPAL CENTERS IN WHITE AND NEGRO NEW-BORN INFANTS

During the last few years, studies of the development of the carpal centers of children have been numerous. To this end roentgenograms have been employed, and have been the means of providing much more reliable and valuable information than the old anatomic method. As a result of these roentgenologic investigations, we have acquired considerable new information as to the period of development of the individual centers, and have learned to recognize various factors which tend to delay or to hasten their appearance. Hardly any of these studies, however, concern themselves with the evolution of the centers at the time of birth. They consider the question of calcification during later infancy and early childhood and treat more particularly of the relation of early or belated mental development to the evolution of the centers. In most of these inquiries the factor of sex is not taken into consideration. The data of the