42 METABOLISM AND GROWTH FROM BIRTH TO PUBERTY. 



tions used in figure 3 and exactly the same comparison will be made 

 throughout the entire age-range. Using our own laboratory curve as 

 the basis for comparison, we note that it lies throughout the entire 

 length above the two foreign curves, thus indicating that our boys are 

 consistently taller for their age than are the foreign boys. Comparing 

 our curve, however, with the Crum-Wood curve, we see that between 

 about 2 years and 4 years our boys are somewhat shorter than the 

 average. From that point on the deviations in our curve above or 

 below the Crum-Wood curve are such as to indicate for the most part 

 uniformity between the two curves. Special attention, however, is 

 called to that portion of the Crum-Wood curve representing the age 

 range below 4 years, as this portion is derived from Crum's measure- 

 ments, which represent "supernormal" infants. It is clear, there- 

 fore, that the average boy as measured by Crum is slightly taller for 

 his age than are our laboratory boys; in other words, there is possibly 

 a slight tendency for our boys to be under height, notably so at about 

 3 years of age. 



The data for Holt's private-school boys, and likewise for our private- 

 school boys, here again show marked superiority over the data for our 

 laboratory boys and over the Crum-Wood average. The private- 

 school boys, therefore, are not only heavier for their age but likewise 

 taller. In other words, the private-school boys are, from the age of 

 8 years (where our study of them begins) and older, distinctly larger 

 individuals both in height and in weight than the average boy of the 

 same age. 



RELATIONSHIP BETWEEN BODY-WEIGHT AND AGE WITH GIRLS. 



Having examined the findings for boys, we may now consider the 

 values for girls, first from the historic standpoint, i. e., of the relation- 

 ship between body-weight and age. This weight-age ratio is shown 

 in figure 5. Fortunately, we have practically as many curves for girls 

 as for boys and from the same sources. The Holt values, however, 

 are missing, as Holt's study was with boys only. Our own private- 

 school data, however, include 323 girls and are fairly representative. 

 The line representing our laboratory studies shows that the body- 

 weights of our girls are noticeably above those of the foreign girls 

 until the age of 1 1 years is reached. At this point the Schmid-Monnard 

 curve distinctly begins to rise above our curve. There is no suggestion 

 of an upward trend in our curve at this point, although our data beyond 

 12 years are not sufficient to indicate what the further trend would be. 

 Up to 8 years our curve lies slightly above the Crum-Wood line, which 

 is considered to represent, for the age-range below 4 years, a rather 

 superior order of children. After 8 years, however, it is apparent 

 from this chart that our laboratory girls are probably somewhat under 

 weight for their age when compared to the American average of Crum 



