DURING POST-NATAL DEVELOPMENT. 



In chart J two curves marked X , one on each side of the center, likewise repre- 

 sent the square root of a tenth of the height-weight index. Each curve is plotted 

 at a distance from the mid-line equal to one-half of this "average" transverse 

 diameter. On comparing this theoretical diameter with the curves of the various 



PER CENT 

 OF STATURE 

 Span 



AGE IN YEARS 



M F 



25 



20 



30 ISVzmo. 15 mo. 



25 4 mo. 4'/zmo. 



Spa 



n Height- 

 weigh.-, 

 index 



\Girth of: 

 Chest 

 Head 



pan 



CHART J. Length relative to stature of the span, of the girths of the head and chest, and of the width of the shoulders, 

 hips, chest, head, and neck. The vertical line at the center represents the mid-sagittal plane. The vertical lines 

 on each side of this represent distance from the mid-sagittal plane expressed hi terms of percentage of stature 

 as shown at the top. The horizontal lines represent height in inches as indicated at the left. At the right is the 

 approximate age in years at which the average heal thy American reaches a given stature. The light curved lines 

 show the relative distance from the mid-sagittal plane of the ends of the transverse diameters given and of 

 one-half the length of the chest-girth, of the head-girth, and of the span. The curve of the height-weight-index 

 growth-curve and the curve of the square root of a tenth of this index are shown by heavy lines. The latter is 

 marked by an X. Female curves, where they differ markedly from that of the male, are shown by dotted lines. 

 The data on which the chart is based are given in table K. 



actual transverse diameters, such as those of the shoulder, chest, head, hips, and 

 neck, it may be seen to follow a similar course and to represent in a satisfactory 

 manner the whole group of transverse diameters there shown. All of these transverse 

 diameters converge toward the mid-line from infancy until the period preceding 



