GROWTH. 



65 



indicate an especially abnormal disturbance in the relationship between 

 body-surface and height, although obviously there is not so close a 

 correlation between height and body-surface as was found between 

 weight and body-surface. Knowing the general correlation between 

 weight and height, we may therefore infer that if there are gross 

 changes in configuration with boys in this age-range, judged from the 

 adult standpoint, they are not such as to disturb materially the 

 relationship between surface area and weight or surface area and height. 



Sq.m. 



BODY SURFACE REFERRED TO HEIGHT. 



BOYS. 



FIG. 10. Relationship between body-surface and height with boys. 



Although from the well-known correlation between height, weight, 

 and age of children of this age-range, one would a priori expect a 

 reasonably close correlation between body-surface and age, we have 

 plotted these factors in figure 11 for our boys. As has already been 

 noted, there is very considerable regularity in the relationship between 

 body-surface and height and body-surface and weight, but, contrary 

 to our expectations, in the relationship between body-surface and age 

 we note rather striking differences, and a straight-line curve will 

 hardly suffice here to indicate the general relationship, particularly 

 at the youngest ages. Beyond the age of 2 years the curve is reason- 

 ably regular in form, but there are wide deviations either side at the 

 higher age-ranges. We thus see that with boys there is a closer corre- 

 lation between body-surface and weight or height than between body- 

 surface and age. As evidence for the rather considerable changes in 



