The data of the earlier papers, namely, Dexter, 1912; Morgan, 1910_c_, 1911_a_, 1911_f_, 1912_f_, 1912_g_; Morgan and Bridges, 1913; Morgan and Cattell, 1912 and 1913; Safir, 1913; Sturtevant, 1913 and 1915; and Tice, 1914, have been summarized in a recent paper by Sturtevant (Sturtevant, 1915) and are given here in table 64. Our summary combines three summaries of Sturtevant, viz, that of single crossing-over and two of double crossing-over. TABLE 64.--_Previously published data summarized from Sturtevant, 1915_. +------------------------+--------+-------------+------------+ | Factors. | Total. | Cross-overs.| Cross-over | | | | | values. | +------------------------+--------+-------------+------------+ | Yellow white. | 46,564 | 498 | 1.07 | | Yellow vermilion. | 10,603 | 3,644 | 33.4 | | Yellow miniature. | 18,797 | 6,440 | 34.3 | | Yellow rudimentary. | 2,563 | 1,100 | 42.9 | | Yellow bar. | 191 | 88 | 46.1 | | White vermilion. | 15,257 | 4,910 | 32.1 | | White miniature. | 41,034 | 13,513 | 32.8 | | White rudimentary. | 5,847 | 2,461 | 42.1 | | White bar. | 5,151 | 2,267 | 44.0 | | Vermilion miniature. | 5,329 | 212 | 4.0 | | Vermilion rudimentary. | 1,554 | 376 | 24.1 | | Vermilion bar. | 7,514 | 1,895 | 25.2 | | Miniature rudimentary. | 12,567 | 2,236 | 17.8 | | Miniature bar. | 3,112 | 636 | 20.4 | | Rudimentary bar. | 159 | 7 | 4.4 | +------------------------+--------+-------------+------------+ {83} SUMMARY OF ALL DATA UPON LINKAGE OF GENS IN CHROMOSOME I. In table 65 all data so far secured upon the sex-linked characters are summarized. These data include the experiments previously published in the papers given in the bibliography and the experiments given here. The data from experiments involving three or more loci are calculated separately for each value and included in the totals. TABLE 65.--_A summary of all linkage data upon chromosome I_.