Brightness and dullness in children . owestclass in which the pisiform is plainly evident. The pisi-form shows simply as a dark spot lying below and to onecorner of the cuneiform. The epiphyses, particularly thatof the ulna, are very poorly developed compared withtheir condition in class ten (radiograph No. 1). Radiograph No. 3 represents one of the least devel-oped hands in the entire group of one hundred. Thereis absolutely no trace of a pisiform bone, and, what ismuch more striking, scarcely more than a speck to repre-sent the epiphysis of the ulna. According to Pryor, theulnar epiphysis ap


Brightness and dullness in children . owestclass in which the pisiform is plainly evident. The pisi-form shows simply as a dark spot lying below and to onecorner of the cuneiform. The epiphyses, particularly thatof the ulna, are very poorly developed compared withtheir condition in class ten (radiograph No. 1). Radiograph No. 3 represents one of the least devel-oped hands in the entire group of one hundred. Thereis absolutely no trace of a pisiform bone, and, what ismuch more striking, scarcely more than a speck to repre-sent the epiphysis of the ulna. According to Pryor, theulnar epiphysis appears typically at the age of six anda quarter in girls, and seven and a quarter in boys. Thishand does not correspond to an age much above will be noted, too, that some of the other bones arevery poorly developed, so that there are large spaces leftbetween them. Sex Differences.—It is well known that girls reachthe age of puberty on the average about two and a halfyears earlier than boys. At this period the anatomical age. SEX DIFFERENCES in of the girl is clearly well beyond that of the boy of thesame chronological age. It is not so commonly realizedthat this difference between the sexes in anatomical ageis well marked by the end of the first year of life, andthat it is present in ever increasing degree from the firstyear up to and beyond the age of puberty. That, however,is the conclusion to which leads either of the measures,eruption of teeth or the ossification of carpals. A comparison of the sexes as regards anatomical agehas been worked out in some detail by Pryor on the basisof carpal ossification. In round figures he finds the fol-lowing differences: From the age of one to the age oftwo, the difference in anatomical age is about one-halfyear. Anatomically, the girl of one and a half years isas old as the boy of two. This difference graduallyincreases. At the age of four the girl is anatomicallyas old as the boy of five. By the age of seven and a halfthe girl


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Keywords: ., bookcentury1900, bookdecade1910, booksubjecteducation, bookyear19