Corals. 



23 



Lessun ill. 



Fig. s. 



A whole sea-fan (Fig. 6) for the teacher, and small pieoes for the 

 children, nith the stony corals hefore need, are needed for this les- 

 son. These shonld be supplemented by a small piece of the precions 

 red coral, and by a blackboard drawing of Fig. 7 in colors. In this 

 red-coral the branches themselves, as well as the flesh covering 

 them, are red, while the separate polyps are white. 



The name fan-coral, or sea-fan is quickly suggested 

 as the teacher's large specimen is held up before the class, 

 after which pupils' observations are ia order : 



My piece of sea-fan is yellow. Mine has dark edges. 

 Mine is made of a great many little branches, that join 

 together in a network. I can break o£E something like a 



