Porter — Relation of Growth to Probable Deviation. 247 
and Probable Deviation is even more clearly seen in the girls’ 
curves (broken lines). The rapid rise begins in them at age 
10 to 11, and reaches its maximum at the same age in both 
curves. The subsequent fall is profound. 
The evidence presented above permits the conclusion: The 
Physiological Difference between the individual children in 
an anthropometric series and the Physical Type of the series 
is directly related to the Quickness of Growth. 
