AND THE FIRST VERTEBRATE. 159 



so to speak, into one another ; it need, therefore, cause 

 no surprise if the primary vertebrate of all the ver- 

 tebrates should prove neither to have been fish, flesh, 

 fowl, nor good red herring ; but for an actual specimen 

 of a living vertebrate that can neither ' swim, crawl, fly, 

 nor walk,' I cannot do better than refer my philoso- 

 phical opponent to a new-born baby. 



