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Lessons in Nature Study. 



examine the shell thoroughly before school. Let her notice 

 something prominent, but not too obvious, about the shell. 

 I am going to give you some shells to-day. I want you 



FIG. 21. THE CLAM-SHELL. (LizziE WRIGHT). 

 a, Outside; , inside; c, front view. 



to observe them very closely. I see something, and I want 

 you to try to find out what it is that I have in mind. 

 Mary. It has fine lines or ridges on the outside. 



