No. 536] NOTES AND LITERATURE 



509 



that some factor essential for sex is associated in the X element 

 with one that is responsible for the sex-limited character." 



The author points out other important parallels of a similar 

 nature. To tlie cytologist probably the most interesting part of 

 Wilson's paper is the suggestion lie makes regarding the possible 

 origin of the X and Y elements. On the whole, this paper 

 greatly strengthens the hypothesis that there is some kind of 

 definite relation between the chromosomes and Mendelian factors 

 in heredity. 



Doncaster, in the Proceedings of the Cambridge Philosophical 

 Society 2 gives a short note on the spermatogenesis of Abraxis 

 (/rossnlariata (currant moth), in which he had previously shown 

 that the grossulariata character is a sex-limited, dominant Men- 

 delian factor, not borne by eggs bearing the female determiner. 

 He finds the mitoses very small, and was unable to count the 

 chromosomes satisfactorily, but says there are between fifty and 

 sixty. Two kinds of primary spermatocytes are found, in differ- 

 ent follicles. One of these appears to be abnormal and is thought 

 not to be functional in fertilization. There is no evidence that 

 the male produces two kinds (male and female determining) of 

 spermatocytes, such as are found in many species. The number 

 of chromosomes visible in the equatorial plate of the first sperma- 

 tocyte division, as well as in the second, is twenty-eight. The 

 oogonial mitoses do not differ recognizably from the spermato- 



In this moth the female produces two kinds of eggs, one female 

 producing and wanting in the grossulariata character, the other 



the female is of the t } r„ss\,hinata or the hirtimh.r type. It is to 

 be expected that the chromosomal provision of the two kinds of 

 eggs would be different ; yet, as Wilson and others have shown in 

 some species for males, the differential chromosomes may not be 

 distinguishable. Doneaster's results are consistent with the 



