U. K. Nabours 



3d 



463 



Expect. 



I 



I 

 BJ 



42 



31-7 



48 

 5i7 



JQJO X JGJG 

 jje X JQJe 



joje X jje 



CJ 

 29 



I 1 



I 1 



jQje jjQ 



462 40 457 



jp X BCBece 



'T^"T^T~T~1 



CP Bje BPQ eve CFQ 

 27 28 28 25 27 147 292 

 31-7 31-7 31-7 31-7 31-7 



413 



In a few matings separations of BBS from BSB%, BGS from B®GS, 

 and C(7H from G@G@ were made in the records. As has ah-eady been 

 indicated, this is a very tedious and difficult undertaking, as the dif- 

 ference between an individual homozygous for and one heterozygous 

 for it is only slight at best. If the determinations are not made within 

 a few days after moulting it is necessary to group them, as was done in 

 most of the matings. Mating (341) {BS& x BS®) was separated with 

 special care, the result being shown in the table. The following 

 matings, grouped in the table, were thus separated, but the mortality 



