42 OBSERVATIONS AND MEASUREMENTS ACADEMY MEMBERS 



[Memoirs National 

 [Vol. XXIII, 



the principal data on these will be given for the benefit of those who may wish to use them. 

 More satisfactory determination, however, in the conviction of the writer, is the mean height 



— j, for the three dimensions, but particularly the length with 



Comparing 



index i 



^Mean of length and breadth,/ 

 the breadth, stand in a compensatory relation to each other (table 33, chart 13). 

 the height with either the length or breadth separately leaves a void that necessitates also the 

 other index and needlessly complicates matters; besides which the classification of the two sepa- 

 rate indices (H-L and H-B) is such as to tend to confuse the student rather than clear matters. 

 The next table gives the three indices: 



Table 33. — Mean height index of the head ' 



Subjects 



Average 



Minimum 



Maximum 



Range of variation in percentage of the average 



cr 



cv 



Members of the Academy 



Old Americans 



100 



78. 44 ±0. 20 



71. 5 



86. 2 



18. 73 



2. 90 ±0. 14 



3. 70 ±0. 18 



Not old Americans 



50 



78. 86 ±0. 23 



72.8 



83.6 



18. 70 



2. 46 ±0. 17 



3. 12 ±0. 21 



Old Americans 



at large (entire 



series,) 



727 

 2 79. 02 

 71. 9 

 88. 1 

 20.50 



DISTRIBUTION 



Old Americans (100) 



Not old Americans (50). 



71.5- 



72.99 



Percent 

 4 

 2 



73- 



74.99 



Percent 



10 



6 



75- 

 76.99 



Percent 

 16 

 10 



77- 

 78.99 



Percent 

 27 

 32 



79- 

 80.99 



Percent 



25 

 32 



81- 

 82.99 



Percent 

 13 

 16 



83- 

 84.99 



Percent 

 4 

 2 



85- 

 86.2 



Percent 

 1 



HEIGHT-LENGTH INDEX OF THE HEAD 



Members of the Academy 



Old Americans 



Not old Americans 



Old Americans 

 at large (except 

 the moun- 

 taineers) 



Subjects 

 Average. 

 cr 



CV 



100 



69. 91 ±0. 20 



2. 94 ±0. 14 



4. 20 ±0. 20 



50 



70. 89 ±0.25 



2. 64 ±0. 18 



3. 72 ±0. 25 



594 

 70. 60 



HEIGHT-BREADTH INDEX 



Members of the Academy 



Old Americans Not old Americans 



Old Americans 

 at large (lab- 

 oratory series) 



Subjects 

 Average. 

 a 



CV 



100 

 89. 02 ±0.24 



3. 61 ±0. 17 



4. 05 ±0. 19 



50 



38. 69 ±0.34 



3. 52 ±0. 24 



3. 97 ±0. 27 



594 

 90.29 



i See following equation: 



Height X 100 



Mean of length -(-Breadth 

 ' In the 247 laboratory subjects 79. 



