THE PROBLEM OF SEX IN PLANTS 361 



of new characters there would be no opportunity for the 

 improvement of plants either by nature or by man. 



The results of all studies and discussions of the question 

 of sex lead us to recognize the fact that it is still largely an 

 unsolved mystery. We must make further and more 

 accurate observations, and be careful and logical in our 

 reasoning, before we can hope to solve this difficult 

 problem. 



