The Behavior of the Chromosomes as Studied through Linkage. 263 



Table XHI. 



Drosophila (Morgan '10a, etc.). 



3 groups, each containing many genes. 

 Abraxas (Doncaster & Raynor '06, Doncaster '08). 



One sex-linked gene. 

 Lymaniria (Goldschmidt '128). 



One sex-linked gene. 

 Silkworm moth (Tanaka 'LS). 



One group of 4 pairs of genes. 

 Fowl (Bateson '09, Davenport '12, Goodale '09, Pearl 12, Pearl & Surface 

 '10, Sturtevant '12a, etc.). 



Ahoux 6 sex -linked genes. 

 Canary (Durham & Marryatt '08, etc.). 



1 sex-linked gene. 

 Pigeon (Cole 12, Staples-Browne '12, Strong '12). 



1 sex-linked gene. 

 Cat (Doncaster 'U, 'LS, Little '12h). 



1 sex-linked gene. 



Man (Morgan '11a, Davenport 11, Newman '1.3, etc.). 



Several sex-linked genes. 

 Sweet pea (Bateson '09, Bateson & Punnett '11a, lib, Punnett '1.3 etc.). 



2 groups, one with 3 and one with 4 pairs of genes. 



Pea (Bateson & deVilmorin '11, Pellew '1.3, Lock '04, Keeble&Pellew '10). 



1 group of 2 pairs of genes, and 2 other doubtful groups. 

 Primula (Gregory '11a, 'lib). 



1 group of 5 pairs of genes. 

 Antirrhinum (Baur 'lib, '12a). 



1 group of three pairs of genes. 

 Stock (Saunders '11, '1.3, Correns '02). 



1 group of probably 4 pairs of genes, and another doubtful group. 

 Lychnis (Baur •12b). 



1 sex -linked gene. 

 Senecio (Trow '13a). 



1 group of 2 pairs of genes. 

 Linum (Tammes '12). 



Genes do not admit of exact analysis. 



Little '13), excluded because the data are insufficient to definitely 

 settle which of the two possibilities is more probable; Aquilegia (Baur 

 '12a): and two cases in beans (Emekson '09, '11). Castle ('03) and 

 Plate ('10) have both suggested linkage in Aglia tau, but the evidence 

 here seems to me hardly clear enough to warrant a decision. The case 

 reported in maize by Collins ('12) I have omitted because the data 

 are not consistent with what we know of linkage in other forms. 

 GOLDSCHMiDT ('12 b) has suggested sex-linkage as an explanation of 



