Referate. 353 
3. Auf Vererbung der Färbung gerichtete Versuche mit schwarzen 
und weißen Pfauentauben zeigten, daß weiße Tiere einen Faktor für blau 
mitführen können, der gegenüber schwarz hypostatisch sich verhält. Aus 
der Paarung weiß >< schwarz gingen in F, lauter schwarz-weiß gescheckte 
Nachkommen hervor, meist mit Vorherrschen der weißen Federn. F, ergab 
schwarz-weiße, weiß-schwarze, weiße und blau-weiße Tiere. Rein schwarze 
Tiere (wie der eine Elter) traten nicht wieder auf. Der Verfasser möchte 
diese eigentümlichen Verhältnisse durch die Annahme von drei Faktoren 
verständlich machen, von denen P = Scheckigkeit, S = Einfarbigkeit und 
C = Auftreten von Farbe überhaupt bedingen soll. M. Daiber (Zürich). 
Recent American and English Papers on Sex-limited Inheritance 
in Vertebrates. 
1. C. B. Davenport. Sex-limited Inheritance in Poultry. (Journ. Exp. Zool. 
13. I. 1912. p. 1—18.) (8 Coloured plates.) 
2. A. H. Sturtevant. An Experiment dealing with Sex-linkage in Fowls. (Journ. 
Exp. Zool. 12. 4. 1912. p. 499—518.) 
3. T. R. Arkell and C. B. Davenport. Horns in Sheep as a typical Sex-limited 
Character. (Science 35. Mar. 8. 1912. p. 375.) 
4. W. E. Castle. Are Horns in Sheep a Sex-limited Character? (Science 35. 
Apr t2. 1912. p- 574.) 
5. F.H.A. Marshall. On the Effects of Castration and Ovariotomy upon Sheep. 
(Proc. Royal Society. B. 85. 1912. p. 27—32.) 
6. C.C. Little. Preliminary Note on the Occurrence of a Sex-limited Character 
in Cats. (Science 35. May 17. 1912. p. 784.) 
7. L. Doncaster. Sex-limeted Inheritance in Cats. (Science 36. Aug. 2. 1912. 
. 144.) 
8. E N. Wentworth. Another Sex-limited Character. (Science 35. June 28. 
1912. p. 986.) 
9. R. Staples-Browne. Second Report on the Inheritance of Colour in Pigeons, 
together with an account of some experiments on the crossing of certain races 
of Doves, with special reference to Sex-limited Inheritance. (Journal of Genetics. 
2. 2. 1912. p. 131—162.) (1 Coloured plate.) 
10. L. J. Cole. A case of Sex-linked Inheritance in the domestic Pigeon. (Science 36. 
Aug. 9. I9I2. pP. 190.) 
In the first of these papers Davenport reviews the cases of sex-limited 
transmission by the female (the Abraxas and Fowl type) and describes a 
new case in Fowls. Both the Brown Leghorn and the Dark Brahma have 
striking sexual dimorphism, and he shows that two of the sexually 
dimorphic characters, the colour of the hackles and of the wing-bar, show 
sex-limited transmission — the dominant character in each case being 
transmitted from the male to his offspring of both sexes, but by the female 
only to her sons. The greater part of the paper is devoted to a review 
of previously known cases, and to a theoretical discussion of the nature 
of sex-limited inheritance. The writer assumes as if it were proved that 
sex-limited characters are borne by sex-chromosomes, of which the female 
in this case must have one and the male two. The confident assumption 
of the truth of this hypothesis is to be regretted when it leads the writer 
to omit from his resumé of previous work the fact that in the experiments 
of Durham and Marryat exceptions were recorded which are not easily 
reconcilable with his view in its simple form. 
Sturtevant (2) describes a somewhat similar case in Poultry, and 
proceeds also to discuss the relations of sex-limited inheritance to chromo- 
somes. He rightly notices that the exceptions recorded in Canaries and 
Induktive Abstammungs- und Vererbungslehre. VIIL 24 
