MADREPORES, ETC. 



159 



ed madrepores, millepores, and retipores, names 

 given them as being descriptive of their dwellings. 



Questions. 



Why have certain animated beings been called zoophytes, 

 or animal plants ? 



To which kingdom of nature do they in reality belong? 



In what manner do some of these grow? 



With what have they been confounded 1 



What are they furnished with for seizing their food 1 ? 



What is coral 1 



In what climates are coral reefs found ? 



In what form do they frequently appear above the surface 

 of the ocean 1 



What takes place when they are exposed to air and 

 heat? 



How are the seeds of vegetation brought to them ? 



What follows in the course of time ? 



Recapitulate the mode in which new islands are produced. 



What is sponge 1 



