. Carnegie Institution of Washington publication. A PHYSIOLOGICAL CHARACTER. 55 With Line 711, as well as with most of the other lines, the courses of the curves for the two strains illustrate the marked effect of environmental influences upon reaction-time (figure 5). LINE 713. The data for Line 713 are shown in tables 19 and 20 and in figure 6. Scarcely more than a glance at figure 6 is necessary to convince one that with Line 713 there was no effect of selection, though the selection data for the last year period are suggestive of a possible selective effect. Environmental influences were o
. Carnegie Institution of Washington publication. A PHYSIOLOGICAL CHARACTER. 55 With Line 711, as well as with most of the other lines, the courses of the curves for the two strains illustrate the marked effect of environmental influences upon reaction-time (figure 5). LINE 713. The data for Line 713 are shown in tables 19 and 20 and in figure 6. Scarcely more than a glance at figure 6 is necessary to convince one that with Line 713 there was no effect of selection, though the selection data for the last year period are suggestive of a possible selective effect. Environmental influences were obviously at play in directing the general course of the curves, which follow each other in an interesting way. The curve for the plus strain is quite irregular, while that for the minus strain is surprisingly free from large minor fluctuations. 600 A5O 300 150 00. 4-5 8-9 12-1 4-5 8-9 12-1 4-5 8-9 12-1 4-5 1912 1913 1914- 1915 FIGURE 6.—Line 713. Reaction-time curves. For the first 4 months the means for the two strains were and seconds (table 19). The difference is + ± seconds. There were 3 very small same-day broods for each strain, with the average for the plus strain 53 seconds the larger (table 18). The large upshoot in the curve for the plus strain for June-July is from an average obtained from a very small number of individuals. The data for the year, August 1912-July 1913, show these means for the plus and minus strains: and seconds. The difference is — ± seconds, times the probable error. The 14 same-day broods for this period have as averages and seconds, the minus-strain average being larger by 88 ± seconds. The extremely fluctuating course of the curves for this year-period indicates that the differences obtained are not due to an effect of selection. During the next year, August 1913-July 1914, the plus mean is higher by ± seconds. (The plus mean is seconds and the minus mean 404.
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