A PHYSIOLOGICAL CHARACTER. 



37 



The mean reaction-times obtained in the tabulation by two- 

 month periods (tables 5 and 6) are used in the plotting of curves 

 (figure 2c), showing graphically the courses of the selection experi- 

 ment with Line 695. 



Table 7 gives in abbreviated form selection summaries of the 

 data for 695 plus and 695 minus by the larger periods (mostly year- 

 periods) into which it was divided in tables 5 and 6; it also includes 

 summaries and results of the " test series" and summaries for selection 

 data for three-month periods during which the test series were con- 

 ducted. In table 7, in the vertical column to the left, are indicated 



TABLE 7. Selection summary for Line 695. 



Time period. 



Apr. 1, 1912- 



July 31. 1912 

 Aug. 1, 1912- 



July 31, 1913 

 Aug. 1, 1913- 



July 31, 1914 

 Test series, 



Aug., 1913... 

 July 1, 1913- 



Sept.30, 1913 



May, 1914 . .' 

 Apr. 1, 1914- 



June 30, 1914 

 Aug. 1, 1914- 



July 31, 1915 

 Test series, 



May, 1915 . . 

 Apr. 1, 1915- 



June 30, 1915 

 Test series, 



June, 1915 . . 

 May 1, 1915- 



July 31, 1915 

 Aug. 1. 1915- 



July 31, 1916 

 Aug. 1, 1916- 



Sept. 2, 1916 



Strain. 



Plus. .. 

 Minus 

 Plus. .. 

 Minus 

 Plus... 

 Minus 

 Plus... 

 Minus 

 Plus. .. 

 Minus 

 Plus. .. 

 Minus 

 Plus . . . 

 Minus 

 Plus . . . 

 Minus 

 Plus. .. 

 Minus 

 Plus... 

 Minus 

 Plus... 

 Minus 

 Plus. .. 

 Minus 

 Plus. .. 

 Minus 

 Plus... 

 Minus 



8-19 



8-19 



20-58 



19-64 



59-10; 



66-99 



61 



67 



55-67 



61-64 



95 



89 



90-10( 

 86-95 

 106-153 45 10 

 100-147 46 



1S2-14S IS 



143 



1431615 

 143-153 

 136-147 

 154-195 

 148-187 

 196-203 

 188-19S 



732 



497.3 

 499.1 

 260.2 

 97.5 

 371.8 

 S71.S 

 522.2 



296 ' B 



AA1 



3Q8.7 



SOS. 7 



350.1 



351. 



399.2 



517.9 



369 



317.9 



397.9 



259.2 

 308.3 

 182.5 

 187.7 

 253.3 

 46.6 

 284.4 

 8.6 



225.4 

 6.S 

 222. 9 

 16. 

 279.4 



244^3 



242.5 

 6 .8 

 338.6 



ese 



6.19 



21.80 

 18.67 

 8.19 



24.49 



8.99 + 0.5 



+si:7 



+ 2 



- 1.0 

 +60.0 



+61.5 



-1-150.8 



11. 69 3. S 

 13.100.04 



'.96 

 10.686!62 



6. 

 22.56 



14.083.63 

 28! 63 2. 



5.0 



the periods covered by the various portions of the summary ; succes- 

 sive columns to the right of this indicate the strain (whether plus or 

 minus); the generations of descent during the period under con- 

 sideration; the number of broods used in selection and in obtaining 

 the data; the average number of individuals per brood of those 

 tested; the total number of individuals tested in making selections; 

 the number of individuals moving to the negative end of the tank; 

 the number failing to respond to the extent of reaching either end of 

 the tank; the average minimum reaction-time; the average maximum 

 reaction- time ; the mean individual reaction-time; standard deviation 



209S52 



