THE FLOWER 251 



of the future. There is but one thing that can be 

 inferred from the facts we know, which is, that along with 

 the growing complexity of organisms, certain external 

 differences arise between the sexual cells, and at the 

 same time we observe that the degree of relationship 

 between them increases. So far as the significance of 

 the sexes is concerned, we are as yet completely in 

 the dark, and it is better to abstain from any explana- 

 tion at all than to indulge in vague hypotheses with 

 no facts behind them. 



