374 



H. G. MAY. 



come up to the standard in facet number or production. In 

 that way the most suitable flies from the most suitable branches 

 were selected, bringing the selections to some extent on the 

 behavior basis. By that method parents whose somatic con- 

 stitution varies from their germinal constitution are to some 

 extent eliminated. 



(rr) re- 

 (f 



(t6) t5- 



(f5) f4- 

 (f4) f3- 



(O) f2- 3 5 ,7 6 



(rt) 



Stook 



(f7) f6- 



, 2 4 



>2 3 6 14 ,19 2, 23 17 



,5 ,6^22 3 4 23^5^,0^17 



5^ 7, 2 6 9 to 



3',X8 ,<, 12 ,3 14 -6 



ij 25 262933, 12 ,4,9 ,220 8 

 FIG. 4. Relation of selected lines and stock in Ba. 



Selections in this stock were carried on for seven generations 

 in each direction, several return selections were made, and crosses 

 in both directions were finally made from'the selected lines. The 

 results are shown in Table II. and in Figs. 3, 4, 5, 6 and 7. 



