Sammelreferat. 



Some Recent Papers on Sex-limited Inheritance. 



1. R. Pearl and F. M. Surface. On the Inheritance of the Barred Color Pattern 

 in Poultry. Archiv f. Entwicklungsraechanik. 30. Festband für Roux. I. Teil. 

 p. 46 — 61. 1910. 



2. R. Pearl and F. M. Surface, Studies on Hybrid Poultry. Ann. Repoit Maine 

 Agric. Exper. Station 1910. p. 84 — 116. 



3. R. Pearl and F. M. Surface. Further data regarding the Sex-limited Inheri- 

 tance of Barred Color Pattern in Poultry. Science. Vol. 32. No. S33. p. S70. 

 Dez. 1910. 



4. T.H.Morgan. Sex limited Inheritance in Drosophila. Science. \"ol. 32. No. 812. 

 p. 120. July 1910. 



5. T. H. Morgan. The Application of the Conception of Pure Lines to Sex-limitid 

 Inheritance and Sexual Dimorphism, .\merican Naturalist. Vol. 45. p. 65. 

 Feb. 191 1. 



Several papers of importance by American writers have appeared 

 during the past year which have added considerably to our knowledge of 

 sex-limited inheritance. In the first three papers under review,. R. Pearl 

 and F. M. Surface describe their experiments with certain sex-limited 

 characters in Fowls. The paper in the Archiv für Entwicklungsmechanik 

 deals with the same work as is described in the Report of the Maine 

 Experiment station, but confines itself to an account of the behaviour of 

 the barred pattern; the later article in 'Science' describes the behaviour of 

 this character in the next generation. Essentially the facts are as follows. 

 Reciprocal crosses were made between the Barred Plymouth Rock and 

 Cornish Indian Game breeds. In the former (B. P. R.) the plumage is 

 finely barred, slightly paler in the male, the shanks are yellow, and the 

 hens are good egg-layers. In the Cornish Indian Game (C. I. G.) the plumage 

 is not barred, and is largely black, with pronounced sexual dimorphism, 

 the shanks are yellow, and the egg-production is poor. Recijuocal matings 

 gave different results, thus: 



C. I. G. 9 X B. P. R. d B. P. R. 5 X C. I. G. d 



Barred 9 (68) Barred d (70) Black 9 (96) Barred 3 (95)- 



Thus when a B. P. R. 5 is mated with a C. I. G. 9, all the offspring 



of both sexes are barred; in the converse cross all the males are barred 



and all the females black. This result is precisely analogous to that 



