Page 15, table 1, column 4, for "158" read "138". Page 16, line 7, for "1146" read "1246". Page 30, table 16, heading, for "we" read "w". Page 42, table 34 A, pedigree 1320, under heading wevf s, for "— —" read "47". Page 43, table 34 C, pedigree 1348, under sf, for "49" read "39". Page 43, table 34 D, pedigree 1425, under wev, for "55" read "5". Page 43, table 34 D, pedigree 1428, under sf, for "13" read "14". Page 47, table 37 (B), pedigree 895, under v, for "7" read "1".
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Calvin B. Bridges (1916) studied this question.