No. 632] SECONDARY SEXUAL CHARACTERS 



241 



from this question it is possible to state that in one of 

 the crosses at least, in which a sex-linked character is in- 

 volved, there is good reason to believe that the normal 

 sex chromosome relations persist. It is scarcely legiti- 

 mate under these circumstances to suppose that the ordi- 

 nary mechanism of sex production is changed in such 

 cases in the sense implied or stated that males have been 

 turned into females and females into males. Moreover 

 it is sometimes overlooked that if such were the case very 

 anomalous sex inheritance would follow were it possible 

 to breed such hybrids. Unfortunately this is not pos- 

 sible in most of the cases at issue, since the hybrids are 

 sterile, but in the few hybrids that have been bred no 

 such disorder of the machinery appears and the individ- 

 uals appear to be true to their sex. One must look, I 

 think, mother directions for an explanation of the results. 



)9. A Male Crayfish with Some Female Organs. Amer. Nat.. 43. 

 orth, J. H. 



913. On Some Pseudo-hermaphrodite Examples of Daphnia pulex. 



Proc. E. Soc. E<linhi,n,h. 33, 307-316. 



i, A. M. 



914. One Hundred Parthenogenetic Generations of Daphnia without 



Sexual Forms. Proc. Soc. Exp. BM. and Med., 11, 180-182. 

 916. Sex Intergrades in a Species of Crustacea. Proc. Nat. Acad. 

 Sri., 2, 578. 



916. A Sex-intererade Strain of Cladocera. Proc. Soc. Exp. Biol. 



•hyllopoden. Jcnaisch. '/.cits. X. 

 the Apodidse. Ann. Mag. Nat 



