WISSLER, MEASUREMENTS OF DAKOTA INDIAN CHILDREN 363 



Owing to tlie expected greater variation in weight, the results are less 

 readily compared, Ijiit they seem to agree with the preceding. The gen- 

 eral result of measurements of white children is that the periods of maxi- 

 mum increase in stature occur at 13-15 for boys and at 13-14 for girls. 

 Now, our measurements show that for mixed bloods the corresponding 

 periods are 13-15 and 11-13 respectively; for Indians, 15-17 and 13-14. 

 Inspection shows that there is a corresponding range for weight and that 

 it holds equally well in exhalation. As the important point has been 

 made that the period of greatest increment is also the period of maxi- 

 mum variabilit}^, we may apply another check to this result. For mixed 

 bloods, the maximum variability for stature occurs at 12-15 and 10-14; 

 among Indians, these are 11-14 and 11-13. For weight, there is corre- 

 sponding agreement. Further, a glance at the tables will make it clear 

 that the tendency is toward the maximum variability values during these 

 intervals. While the number of cases is small and the irregularities in 

 some values distressing, the general consistencies of the above differences 

 in maximum period gives them considerable probability. 



In some recent studies of this character, the method of correlation was 

 used to show that the relation between stature and weight and perhaps 

 other size values also reached its maximum at the period of greatest 

 growth. While the number of cases in our data is scarcely sufficient for 

 satisfactory results, they are, nevertheless, as large as used in some other 

 investigations. Hence, we have made some of the calculations for com- 

 parison. Table 5. 



For white children the following correlation values may be taken as 

 the standard: 



For white boys, the maximum correlation occurs for 10-12 ; for Indian 

 boys, 10-13; for white girls, 10-11 ; for Indian girls, 11-12. The mixed 



