Dr. Rotch, of Boston, in his admirable work on "The Roentgen Ray in Pediatrics," has pointed out the need of improvement in our method of standardizing or grading growing children as to their capacity for physical and mental work. He has made the interesting and novel suggestion that the stage of ossification of the carpal bones as determined by the radiograph may be used for this purpose. If it be shown that such a test can be made and interpreted with accuracy, and that it will give an accurate index of physical and mental capacity of the subject, a very valuable contribution to the domain of preventive medicine will have been made.
The investigations described in this paper were undertaken with a view to applying the ingenious method proposed by Dr. Rotch to a few cases, and tabulating the results. These investigations have not covered the question of the relation