CHANCES IN INDIVID! AL lll'lLI). 



1 



parable. Even if we exclude from consideration children of the rapid 

 developmental period, under 18 years of age, BtiU we have the prob- 

 lem of individual change of build in mature life. Since Btature is 

 practically immutable at this period, change in build may be measured 

 by change in weight. That change in weight does occur is notorious. 

 Figures 3 to 6 illustrate graphically the changes in weight in various 

 individuals from records taken almost at random. In figure 3 the 

 curves of increasing weight run rapidly upward; in figure 4 they go 

 up and then fall again; in figure 6 they are more nearly horizontal. 



Table 5. — Growth-periods in children. 



[Modified from C. W. Strata, 1922, p. 87.] 



Year of age. 



First (neutral) child age. 



to 1 



Infancy. Lactation. 



1 to 2 



2 

 3 

 4 

 5 

 6 



3 



4 

 5 

 6 



7 



.First period of filling out. 

 . First stretching. 



Second (bisexual) child age. Youth. 



Boys. 



Girls. 



7 to 8 



8 9 



9 10 



10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 



11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 



Second period of filling out. 



Second stretching (shooting up in 

 stature). Change of voice. 



Third period of filling out (broaden- 

 ing of chest; rapid increase in 

 weight). Maturity. 



Second period of filling out (round- 

 ing of hips and l<Ts). 



Second stretching (shooting up in 

 stature). Menstruation; bet 

 ning breast development. 



Third period of fullness (rapid in- 

 crease in weight). Maturity. 



On the whole, the weight tends to increase with age. Thia is Bhown 

 by the tables of the "Medico-Actuarial Mortality Investigation" | vol 

 I, pp. 38 and 67). The tables are reproduced in our tables <'» and 7. 

 They show that, on the average, weight tends to increase with age 

 up to 50 or 51 years. The fact that there is, on the average, an 

 increase in build, makes necessary an adjustment in BOme a of 



the youthful indices of children to make them comparable with the 

 adult indices of their parents. 



The adjustment was made to the weight of the child by finding in 

 the appropriate column of stature and line ot' age the expected weight 



