THE RATE OF GROWTH 



99 



It has been calculated by a simple mathematical pro- 

 cess where these ten-per-cent. increments fall, and 

 from each point in this curve where there has been 

 such an increment, a vertical line has been drawn, as 

 you see here. These lines are very close together at 

 the start. One ten per cent, after another follows in 

 a short interval of time, but gradually the time, as 



30 125.02 I bs. 



_80 



y /I 



20 48.20 I bS. 



3yrs 



FIG. 32. CURVE SHOWING THE GROWTH OF MAN FROM BIRTH TO MA- 

 TURITY, with vertical lines added to mark the duration of the periods for each 

 10 per cent, addition to the weight. 



indicated by the space between two of these vertical 

 lines, increases, and when the individual is three years 

 old, you can see there has been a very great lengthen- 

 ing out of the period which is necessary for it to add 



