3 1 o Appendixes 



1911, p. 601. The authors disagree with some of Staples- 

 Browne's conclusions. He had held that blue was a dilute 

 form of black, and that silver is similarly a dilute form of 

 dun ; but Bonhote and Smalley came to the conclusion that 

 silver is dilute blue. It is not in dispute that blues do not 

 throw blacks, and that silvers do not throw duns, and that 

 both blue and dun are recessive to black. As however 

 there is no microscopical or chemical test by which the 

 nature of the pigments can be certainly distinguished the 

 point in question cannot be positively decided at present. 



LEPIDOPTERA. 



[For sex-limited cases in Colias, &c. see Appendix to 

 Chap. X.] 



Aglia tau and the dark vars. lugens, &c. have been 

 investigated again by Standfuss, see especially Iris, 1910, 

 xxiv. p. 155, and Deut. Entom. National- Bibliothek, 

 1910, i. In these experiments the peculiar sex-distribution 

 before recorded was not seen again. For an interpretation 

 of Standfuss's results, see Plate L, Arch. Rass. u. GeseL, 

 1910, Hft. 6, p. 678. 



Pygaera. Important paper on species-hybrids. Federley, 

 H., Arch. Rassen u. GeseL-Biol., 1911. 



Bombyx mori. Extensive series of experiments on 

 genetics of Silkworms. Kellogg, V. L., Leland Stanford 

 Univ. Piibl., No. i, 1908. As regards the colours of 

 cocoons many special idiosyncrasies of strains and of 

 individuals were found, which have not yet been analysed 

 successfully. The larval colours were more regular in their 

 behaviour. 



DIPTERA. 



Drosophila ampelophila has been the subject of elaborate 

 investigation by Castle and his assistants (see especially 

 Proc. Amer. Acad. Arts and Sci., XLI. 1906) with special 

 regard to the genetics of fertility ; by T. H. Morgan (chief 

 paper in Jour. Exp. Zoology, 1911, Vol. xi. p. 365), who 

 has discovered many recessive forms, and shown that 

 remarkable cases of sex-limited inheritance occur (see 

 Appendix to Chap. X.) ; and by Lutz (Carnegie Institution, 



