I20 MENDELISM chap, xi 



From all this it is clear enough that there is 

 much to be done before the problem of sex is solved 

 even so far as the biologist can ever expect to solve 

 it. The possibilities are many, and many a fresh 

 set of facts is needed before we can hope to decide 

 among them. Yet the occasional glimpses of clear- 

 cut and orderly phenomena, which Mendelian 

 spectacles have already enabled us to catch, oifer a 

 fair hope that some day they may all be brought 

 into focus, and assigned their proper places in a 

 general scheme which shall embrace them all. 

 Then, though not till then, will the problem of the 

 nature of sex pass from the hands of the biologist 

 into those of the physicist and the chemist. 



