DURING POST-NATAL DEVELOPMENT. 



511 



French boys given by Godin (1910) correspond fairly well with my curve. Lands- 

 bcrger (1888) gives a greater relative height for the knee-joint than Quetelet. The 

 Schwerz data (1910) show an average lower height of the knee-joint of nearly 1.5 

 per cent of the stature than that shown in my curve. Schwerz finds the knee-joint 

 in girls relatively higher than that of boys of the same stature except at ages 9, 10, 

 and 11, at which they are the same. The children studied were from 6 to 14 years 

 of age. There is a conflict in recorded data as to the relative height of the knee in 

 males and females. The limited number of observations I have made show the 

 female knee-joint slightly higher in adolescents. The relative heights of the knee- 

 joint given in table L are not comparable for men and women because of uncertainty 

 of similarity of technique of measurement. Hitchcock (table L) shows the knee-joint 

 lower in short than in tall individuals and higher in young than in mature men. 



Height of ankle-joint. The top of the joint cavity lies opposite the prominence 

 of the medial malleolus, not its tip. The curve labeled "ankle-joint" in chart I 

 shows the former level and hence is somewhat higher than it would be if it repre- 

 sented the latter level. The data given by Quetelet (table E) for males corre- 

 spond with the curve shown in chart I. Quetelet gives a lower height for the female 

 than the male ankle-joint, which equals 0.5 per cent of the stature in the adult. 

 Godin (1910) gives a uniform height of 4.5 per cent of the stature during adoles- 

 cence, 4.6 per cent in the adult. Schwerz (1910) gives a height of 4.3 per cent of the 

 stature at the age of 6, 4.2 at the age of 14 for boys, 4.7 per cent and 4.2 per cent 

 at the same ages for girls. Weissenberg (1911) gives the relative height of the foot 

 in male infants as 6.5 per cent, of female infants 6.1 per cent. In the adult the 

 figures are respectively 4.7 per cent and 5.0 per cent. 



Segmented proportions of lower extremity. Comparing the parts of the lower 

 extremity in infant and adult, we obtain the following approximate proportions of 

 height of segment to length of limb : 



TABLE 14. 



From these figures it may be seen that the thigh changes little in length relative 

 to the limb as a whole measured from the trochanter or from the iliac crest. On 

 the other hand, from the standpoint of the free extremity the leg changes compara- 

 tively little in relative length while the thigh elongates. In all cases the relative 

 height of the foot is reduced. 



Length of foot. This measurement has not been plotted in chart I, but it is 

 tabulated in table K. Weissenberg's data (1911) show an increase in relative 



