46 MASS STUDIES IN BUILD. 



mating and, indeed, a mating of similars. This result agrees with the 

 findings in respect to stature; similars tend to mate; while in the 

 case of temperament, dissimilars tend to marry each other. 



THE BASAL TABLES. 



In the Appendix are given in tabular form details concerning the 

 different types of matings, with some information concerning the 

 grandparents, the sibs of parents, and the children. These are the 

 tables that have been used for the mass study and from which table 

 11 was drawn up." They will afford much of our data for the detailed 

 Mendelian studies, and will be briefly considered in this section. 



These tables are derived chiefly from the Records of Family Traits; 

 some from special schedules and, in a few cases, from the A file of the 

 Eugenics Record Office. 



Table I. — Mating of very slender, 1.50 to 1.75 metric (21 to 25 English) X 

 very slender. This combination does not occur in our 506 standard 

 matings. 



Table //.—Matings of very slender X slender. 1.80 to 2.10 (26 to 30) . There 

 are seven matings altogether. They yielded 20 progeny: 4 VS, 12 S, 

 2 M, and 2 F. Four-fifths of the progeny thus fall in the parental 

 groups; the distribution shows little variability (fig. 9). 



Table ///.—Matings of very slender X medium, 2.2 to 2.6 (31 to 36). 28 

 children derived from 8 matings have indices of build as follows: 



1 VS, 7 S, 17 M, 3 F. The mode of the progeny, as compared with 

 table 2, has shifted to the medium grade (fig. 10 1. 



Table IV.— Matings of very slender X fleshy, 2.6 to 3.0 (37 to 43). There 

 are 5 matings. These yielded 25 progeny: 1 VS, 5 S, 10 M, 7 F, and 



2 VF. The mode is at medium grade, but the whole distribution is 

 much more variable than in tables 2 and 3 (fig. 11). 



Table V. — Matings of very slender X very fleshy, 3.1 to 4.5 (44 to 64). 



There is only 1 mating in this class, so that no table is formed. It 



is described in full on page 97. It produced 7 children: 3 S, 3 M, 



and 1 VF. 

 Table VI. — Matings of slender X slender. There are 24 matings of this type. 



They yielded 51 progeny: 5 VS, 35 S, 11 M. The mode is strongly 



in the S grade; the progeny show relatively little variability (fig. 12). 

 Table VII. — Matings of slender X medium parents. There are 101 matings 



of this type. They yielded 313 progeny: 49 S. 200 M, 53 F, 11 VF. 



The mode is at medium; the progeny show rather low variability 



(fig. 13). 

 Tabic VIII. — Matings of slender X fleshy parents. There are 52 matings of 



this type. They yielded 179 progeny: 5 VS, 25 S, 85 M, 57 F, 7 VF. 



The mode is at medium; the progenv show rather low variability 



(fig- 14). 



°The families in the tables of the Appendix which are marked by an asterisk (*) are not 

 included in table 11. The reason is that they were selected families, usually because containing 

 very fleshy persons. It was deemed undesirable to combine these selected families with the un- 

 selected families that make up most of table 11; a table which forms the basis for figure 7. To 

 have included them would have distorted the form of that figure. 



