A PHYSIOLOGICAL CHARACTER. 



81 



lines (29 months), representing 95 generations in the plus and 91 

 generations in the minus strain. The data are given in tables 37 

 and 38 and figure 13. 



The courses of the reaction-time curves are extremely irregular, 

 although in a general way the curves follow each other in a manner 

 to suggest environmental influence upon reaction-time. It is obvious 

 that there was no effect of selection. 



TABLE 37. Selection summary for Line 796. 



Time period. 



Dec. 25, 1914- 



July 31, 1915 

 Aug. 1, 1915- 



July 31, 1916 

 Aug. 1, 1916- 



May 1, 1917 

 Test series, 



Aug. 1916. . . 

 July 1, 1916- 



Sept. 30, 1916 



Strain. 



Plus.. 

 Minus 

 Plus. . 

 Minus 

 Plus . . 

 Minus 

 Plus. . 

 Minus 

 Plus . . 

 Minus 



1-28 



1-27 



29-66 



28-61 



67-95 



63-90 



68 



64 



65-71 

 61-68 



28 



2713 



38 



sa 



22 



20 



20 



20 32 

 7 16 

 714- 



?* 



C bD 



if 

 I* 



343 



351 

 604 



302 



662 

 643 

 116 



II 



"sr 



I! 



117 

 147 

 301 

 175 



98 



379 

 869 



76 

 28 



244 

 359 

 364 

 454 

 220 

 144 

 256 

 189 

 346 



876 



857 

 839 

 692 

 710 

 900 

 900 

 828 



555.5 



004.5 

 619.1 

 697.6 

 449.4 

 393. 7 

 675.6 



662! 4 

 453.5 



289.5 

 290.9 

 291.9 

 297.2 

 331.1 

 311.9 

 286.6 

 302.5 

 201.3 

 315.5 



10.5 



10.5 



8.0 



12.3 



12.8 



14-1 



7.5 



5.1 



12.6 



21.7 



s 



B 



5 



-49.3 



+55.7 



+2i!<j 



+208 '.6 



14-9 



14-7 

 19.1 



11.0 



25.1 



3.31 



5.33 

 2.92 



8.31 



TABLE 38. Same-day broods. Summary of data for Line 796. 



Time period. 



Dec. 25, 1914- 

 July 31, 1915 



Aug. 1, 1915- 

 July 31, 1916 



Aug. 1, 1916- 

 May 1, 1917 



Strain. 



Plus.... 



Minus . . 

 Plus .... 

 Minus . . 



Plus 



Minus . . 



I 



8.4 



7. 

 13.9 



5.5 

 17.0 



415.5 



59 

 52 

 139 

 55 

 68 

 63 



IJ 



329 

 154 

 382 



345 



900 

 757 

 900 

 504 

 900 

 510 



1 



634 



523 

 674 



723 



503 



283.10 

 251.50 

 176.68 

 255.57 

 291.84 

 303.54 



24.86 

 26.36 

 10.11 

 21.54 

 23.87 

 25.75 



betwe 

 minus 



+111 



+220 



36.233.06 



'.24 

 .26 



.070 

 .146 



The mean reaction-times for the first longer period (8 months) 

 of the experiment were 555.5 and 604.8 seconds, the plus strain 

 being the more reactive by a margin of 49.3 14.9 seconds, a differ- 

 ence 3.31 times the probable error (table 37). The 7 same-day 

 broods for this period gave averages indicating greater reactiveness 

 for the minus strain by a difference of +111 36.23 seconds, more 

 than double the difference obtained from the entire data for this 

 period and in the reverse direction (table 38). 



