(25a) 



Table VIII. 

 Jelection experiment 4, mass selection. 



High series-parents with 3 or 4 spines. 

 Low series-parents with C, 1 or 2 spines 



Period Time. no. of inci. av . sp. no. Difference 



between 

 of high and 



low lines, 



Multipli- Juiie 29-July 8. 9 3.11 t .22 



cation. July 9-16. 28 2.39 t .14 



July 19-30. 96 2.44 i .08 



Selection. Aug.l-1( 



Multipli- 



Aug, 26- Sept. 3, 



