152 THE MENDEL JOURNAL 



And the facts of the experiments may be in- 

 terpreted by assuming that the " cuckoo " factor is 

 repelled by that for femaleness, so that the two 

 can never occur in the same germ-cell. Hence all 

 germ-cells which carry femaleness will be devoid of 

 this barring-factor. The case, indeed, seems to be 

 similar to those which we have already more fully 

 discussed. 



We pass on now to consider sex in Man. From 

 the general fact which has been obtained from 

 statistics derived from various sources, that the 

 number of males and females are approximately equal 

 at birth, we may say that in Man, too, the inheritance 

 of sex is probably Mendelian, and follows the scheme 

 D R yRR. We have no reliable evidence at 

 present which will enable us to say whether maleness 

 or femaleness in Man is dominant. We may, how- 

 ever, tentatively infer that in Man, as in moths, 

 canaries, and fowls, the female character is domi- 

 nant, and therefore hybrid with regard to sex, since 

 occasionally masculine secondary characters may 

 appear in women. The appearance of such characters 

 is, presumably, indicative that they are carried by 

 woman, though usually not manifested. 



Quite recently a book on Sex in Man, written 

 by Dr. Eumley Dawson, has appeared.* It does not 

 deal with the subject from the Mendelian standpoint, 

 — indeed, the author is apparently not acquainted 

 with Mendelism. But he formulates a remarkable 



*^ A review appears on page 212 of this Journal. 



