Key points are not available for this paper at this time.
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
Calvin B. Bridges (Sat,) studied this question.