66 



METABOLISM AND GROWTH FROM BIRTH TO PUBERTY. 



surface area that may actually occur in children of the same age, these 

 points are of interest, although it is clear that age itself is not an 

 accurate index of surface area, any more than it is an accurate index 

 of height or weight. 



2 3 4 5 6 7 8 9 10 11 12 13 14 15 

 FIG. 11. Relationship between body-surface and age with boys. 



RELATIONSHIP BETWEEN SURFACE AREA AND BODY-WEIGHT, HEIGHT, AND AGE 



WITH GIRLS. 



In figures 12, 13, and 14 we have plotted the relationships between 

 body-surface and body-weight, body-surface and height, and body- 

 surface and age for our girl subjects. The picture in all three instances 

 is strikingly similar to that found for boys. The relationship between 

 body-surface and weight is closely approximated by a straight line, 

 although a slightly smoothed curve, as sketched on the chart, fits the 

 situation somewhat better. No pronounced bend in this line is to be 

 noted at any particular weight. The body-surface is not so closely 

 correlated to height as to weight, as is seen by the somewhat wider 

 scattering of the points about the curve sketched on figure 13. Thus, 

 while girls of the same weight have essentially similar surface areas, 

 girls of the same height may vary rather considerably in surface area. 

 Perhaps the widest difference is noted with the two girls having heights 

 of 85.5 cm. and 86.5 cm. Here the difference in height is but 1 cm., 



