celled animal having similar sides, to pioneer in 

 matters of sex, and, by the same token, the first 

 to creep . . . 



Here it may be objected that there are still 

 lower animals to which one or the other of the 

 foregoing attributes can be as easily applied — 

 such, for example, as certain jellyfishes, which are 

 single-sexed, and the anemones, which move about 

 by crawling. But I would point out that the first- 

 named are able only to swim ; and swimming is the 

 most primitive method of free locomotion, a fact 

 which is found indicated in the embryological, if 

 not the larval, development of all animals. As to 

 the second-named form, its manner of crawling, 

 the minutiae of which cannot be gone into here, is 

 totally different from that of the flatworm; more- 

 over, its reproductive processes are not truly 

 sexual, as this term is ordinarily understood. 

 Again, it should be remembered that none of these 

 creatures is a bilateral animal, a feature which 

 preeminently distinguishes the flatworm. 



In truth, it is to this primordial precedent that 

 man traces the reason for his own structure. The 

 fundamentals of that reason, I have, I believe, 

 now made clear. But how fraught with potentiali- 



[184] 



