SEX 377 



more easily influenced, if at all, after fertilization. But it is quite un- 

 known whether or not an individual which had undergone a reversal of 

 sex would be as successful biologically as a normal one. Unusual fea- 

 tures may be expected in a sexually functional organism with the chromo- 

 some complement normally accompanying the other sex, if such an 

 organism should be found; but such interesting questions can only be 

 answered by the facts yielded by further research. 



All questions of sex control are secondary to the main problem of the 

 ultimate nature of sex, a problem which reveals itself with increasing 

 clearness as primarily a physiological one. The question of the origin 

 and significance of sex is one which lies outside the scope of this work. 



Bibliography at end of Chapter XVIII. 



