m. 643] STUDIES ON THE DURATION OF LIFE 177 



smaller than is desirable, but these experiments represent 

 a relatively early stage of the work before the technique 

 of getting maximum progenies for life table work had 

 been perfected. Further it must be roniciiil)ere(l that the 

 individuals in any column are the ])rou( iiy of only one 

 single pair of parents. The source of thr lines tuiicther 

 with other pertinent data are shown in Table I. 



Five of these distributions are shown iirapiiieally in 

 Fig. 1, and their biometric constants are given in Table 



TABLE III 



