742 Home Nature-Study Course. 



questions on the form of a fish 

 I. What protection to fishes are the dorsal spines? 



2. Of what use to a fish is the absence of a neck? 



3. Why does plant life in the aquarium aid in keeping the water 



pure? 



4. Describe or draw a scale of a fish. Of what use are scales to the 

 fish? Do all fish have scales? What are the exceptions that you know of? 



i,>;5'r.-Is the lateral line always present on fish! 



6. How can you tell by examining the mouth and gills of a fish the 

 nature of its food? 



7. Have you a fish in an aquarium for study? 



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