SEX-LIMITED HEREDITY IN CERTAIN CROSSES. 



151 



The hybrids obtained from the blond and red ring crosses were further bred as 

 follows : 



A hwnilis-risoria male and another risoria-humilis male were mated to 

 female alba. The former cross tested fully fertile (table 141) ; four tests failed with 

 the latter. In all tests elsewhere made (tables 148, 149) these risoria-humilis 

 hybrids, like the alba-hwnilis hybrids referred to above, show a very low fertility; 

 or rather they show many germs which fall short of complete development. 



The humilis-risoria hybrids, particularly the males of the group, seem very 

 much more fertile. This fertility is quite complete with female alba (table 141); it 

 is practically the same with female hmnilis (table 142); it is much less so with 

 female risoria (table 143) and with female humilis-risoria fertility is very low 

 (tables 146, 147). The female humilis-risoria were but partially fertile with a 



d-Bl. 

 9 B2. 

 9 CI. 

 cT C2. 



Table 140. 

 cf St. humilis (THI-3) ; dead Jun 

 9 St. risoria (h. 9) ; 1899. 



5/31/00... darker 7/10/00 1| 



6/2/00 .... lighter, fertile . . 4/5/06 70 mo. 



6/18 lighter, fertile, .alive l/?/02 22 mo. 



6/20 fertile (pi. 22) . . 7/4/05 60i mo. 



7/23 risoria-humilis, infertile; 7/25/06.72 mo. 



7/25; no development. 

 8/5; not hatched. 



8/7 died 10 days old (food ?) 5 mo. 



8/.30 fertile 5/23/05 57 mo. 



9/1 dark (fertile). . .alive 4/?/02 19 mo. 



12/19; no development. 

 12/21; no development. 



9 M 1. 5/29; hatched; 3/14/05; 46j mo. (see pi. 22). 

 M 2. 5/31; probably no development. 



9 N. 7/5 hatched 9/9/03 26 mo. 



d' O 1. 8/5 dark 2/12/02 6 mo. 



902. 8/7; hatched (weaklyfertile with L 2); 9/7/05; 49 mo. 



H 1. 1/10/01; no development. 

 H2. 1/12/01; no development. 



11. 2/6 hatched (care?) 4/4/01 2 mo. 



12. 2/8 hatched alive 4/?/01 2 mo. 



Jl. 2/25 hatched 4/8/01 'ijmo. 



<f J2. 2/27 hatched 11/16/01 (care). 



K 1. 3/27; not hatched. 

 cfK2. 3/29 fertile aUve 3/1/05. . .47+ mo. 



L 1. 4/28; some development, 

 c?" L 2. 4/30; (weakly fertile with O 2) ; killed 3/28/04; 35 + mo. 



P 1. 3/25/02; not hatched. 



cf' P 2. 3/27/02. . .dark ' 2/3/04 22 



9 Q 1. 4/29 dark 6/21/04 26 mo. 



9 Q2. 4/31 hatched 1/8/04 20^ 



9 R 1. 6/2 hatched 6/20/03 12^ mo. 



d' R 2. 6/4 hatched 8/2/03 14 mo 



9 S 1. 7/8 dark alive 3/25/03 . . .9+ mo 



d" S2. 7/10 dark alive 3/25/03 . . .9+ mo 



9 T 1. 8/14 dark 9/15/03 13 mo. 



T2. 8/16 dark 3/25/03; missing. 



9 Ul. 9/21 hatched 1/14/04 16 mo, 



U2. 9/23 hatched alive .3/25/03. . .6+ 



V 1. 1/9/03 lone hatched, li 

 V2. 1/11/03/ development. 



W 1. 3/6; no record. 



W 2. 3/8; no record. 



2 weeks; other some 



(DD 8, DD 10) 



' The darker and lighter shade8>ere not thus classified during 1902. — Editor. 



