(21a) 



Table VI. 

 Selection experiment 2, mass selection. 



High series- parents with 2 or more spines. 

 Low series- parents with 1 or spines. 



Mean of clone (55 ind,) when selection began- 1.51 spines, 



Between Progeny produced in Difference between 

 solec- High series. Low series. high ana low 

 tions. ind. mean sp.uo. ind. mean sp.nc. means. 



1 and 2 25 1.96*. 14 29 0.31±.13 1.65*. 19 



2 and 3 5 i.40±.30 9 0.00 l,40i,30 



3 and 4 5 0.40t,30 



