INDIVIDUALS AND MEASUREMENTS CONSIDERED. 37 



unlike data. The determination of constants on the basis of groups of 

 individuals just as they became available has the advantage that the 

 selection of groups can not be influenced by the personal equation of 

 the statistician. 



Later in this volume we shall make some further classification of 

 the data. 



Since the data have been treated in individual groups as collected, 

 in special groups arranged by both ourselves and others, and in com- 

 bined series, there can be no criticism whatever as to selection of data. 

 The constants for the data arranged in a number of different ways have 

 been presented and discussed in as nearly as possible an unbiased 

 manner. The full original data are laid on the table for anyone who 

 cares to arrange them differently, to go back of our constants, or to 

 carry the analysis farther than we have done. 



The fundamental measurements upon which all the statistical 

 constants in this volume are based appear in tables A to D. 



Tables A and B for male and female infants require no comment. 

 Table D for women requires merely the note that Nos. 1 to 68 represent 

 the original series, No. 69 the only woman included in the first supple- 

 mentary series, and numbers 70 to 103 the individuals of the second 

 supplementary series. In all calculations individual 69 has been treated 

 with the second supplementary series, and to avoid confusion in dis- 

 cussion both have been consistently referred to as the supplementary 

 series. 



The table for men, C, is somewhat more complicated. Nos. 1 to 16 

 are the athletes, Nos. 17 to 27 the vegetarians, while Nos. 28 to 89 are 

 the "other males," that is the non-athletic and non-vegetarian men of 

 the original Nutrition Laboratory series. From this original series of 

 89 men Gephart and Du Bois have made a selection of 72 upon which 

 they have based certain calculations. The key numbers and initials 

 of the 17 which they have discarded are given on page 34. Nos. 90 

 to 117 represent the first supplementary series and Nos. 118 to 136 the 

 second supplementary series. 



After the calculations for this volume were completed, it was dis- 

 covered that through a change in the key letters used to designate the 

 subjects, T. H. Y. and T. J. (Nos. 20 and 129) are the same individual. 

 Since the measurements were made at 23 and 27 years respectively, 

 and since body-weight and body-surface-area differ slightly at these 

 two periods, he has been treated as a different individual in the two 

 series. The ages as originally submitted were 22 and 28 years. The 

 actual date of birth (available since the calculations were completed) 

 gives 23 and 27 years, as more nearly the ages at the time the observa- 

 tions were made. The constants have been allowed to stand as com- 

 puted from the values given in the table, since the change could hardly 

 have made a sensible difference in the end results. 



