Ccelenterates 43 



immediately accepted with enthusiasm. 

 This is clear proof that the nerve cell 

 has come into being. The one-celled 

 animals blindly lash the water, thus 

 creating a current, and must take that 

 which comes their way. The more 

 cultured sea-anemone deaf, blind and 

 brainless has begun to develop a capacity 

 for " selection." 



The Hydroids are far more suggestive 

 of plants than of animals. They increase 

 by the processes of egg-laying, budding 

 and the :t alternation of generations." 

 Budding is effected by a number of 

 cells collecting at one side of the polyp, 

 appearing as a sort of tumour on the 

 parent individual, and detaching them- 

 selves. 



When eggs are laid these hatch into 

 free-swimming larvae which for some 

 time paddle about by means of whips 

 (flagella) and then settle on some fixed 

 body or parent hydrozoan. In the 



