A NOTE ON PARASTTIC KERONA. 189 



in a similar way to that which they do when purely foreign 

 organisms are engulfed. 



Has the Hydra a spark of intelligence ?— or is it mere 

 chemical stimuli ? 



The first explanation seems high, but the second certainly too 

 low, and here we are compelled to leave the psychical life of the 

 lower organisms and those happenings in their lives which 

 suggest control, and say with Professor Thompson, " that there 

 is no reason why any evolutionist should doubt that they have 

 in them the indefinable rudiments of mind." 



Kerona polyporum (parasitic on Hydra). 



