. Carnegie Institution of Washington publication. A PHYSIOLOGICAL CHARACTER. 103 been conducted during any of the following months (under usual environmental conditions), when the plus strain was more reactive, the plus strain would have had a much lower mean and the minus strain possibly a somewhat, but probably not much, lower mean, so that the difference would have been much It is interesting, however, to have this test series come at a time of relatively high 900 750 600 450 300 150 OO. 5-10 5-10 5-IO 5-10 1913 1914 1915 1916 11-4 1917 * FIGURE 19.—Line 757. Reaction-time curves b
. Carnegie Institution of Washington publication. A PHYSIOLOGICAL CHARACTER. 103 been conducted during any of the following months (under usual environmental conditions), when the plus strain was more reactive, the plus strain would have had a much lower mean and the minus strain possibly a somewhat, but probably not much, lower mean, so that the difference would have been much It is interesting, however, to have this test series come at a time of relatively high 900 750 600 450 300 150 OO. 5-10 5-10 5-IO 5-10 1913 1914 1915 1916 11-4 1917 * FIGURE 19.—Line 757. Reaction-time curves by six-month periods with similar curves for Line 740 superimposed . As noted on pages 87 and 88, the minus strain of Line 740 was exceptionally slightly reactive compared with the other Simocephalus minus strains (Line 757 excepted) during the period from April to September 1916, while the 740 plus strain was exceptionally reactive during Octo- ber 1916 to January 1917. Hence the point representing the mean|for the minus strain for the "5-10" 1916 period is exceptionally high, while the point for the^plus_mean for^the "11-4" period following is exceptionally low. reaction-time for the plus strain and yet find the difference in means so markedly significant. In the final nine-month period (August 1916-April 1917) of the experiment with Line 757, the mean for the minus strain was double 1 The mean for the minus strain in this test series was only 5 seconds higher than during the earlier test series conducted 2f years earlier (September 1913). On the other hand, the mean for the plus strain was 288 seconds higher in the later than in the earlier test series. Yet, in general, the plus strain during the latter part of the experiment was very much more reactive than during the earlier portion of the experiment. The explanation of these peculiar means compared with the means for the selection data lies in the following facts: (1) The plus strain of Line 757 was m
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