THE STUDY OF THE FROG AS AN INTRO- 

 DUCTION TO MAN 



PROBLEM XXXVII 



Some adaptations in a living frog-, as an introduction 

 to the study of man. 



Material. Live frogs, battery jars, charts. 



a. External Bodily Adaptations 



Observations. 1. How does the shape of the frog differ 

 from that of the fish ? 



2. What is the general color of the frog ? What markings 

 are there ? 



3. Is the skin rough or smooth ? 



Conclusions. 1. In. what sort of surroundings would the 

 general color and markings of the frog tend to conceal it ? 

 2. Has the frog an exoskeleton ? 



b. Adaptations of Appendages for Habitat 



Observations. 1. How many appendages are there ? What 

 are they ? 



2. What is the greatest difference between the fore and 

 hind legs? 



3. What is the resting position of the hind legs ? 



4. How do the feet differ ? Note. The thin membranes 

 between the toes of the hind feet are called webs. 



5. Describe the web of one of the feet. 



6. Cause the frog to swim. Which legs are of the most 

 service in swimming? In hopping? 



7. Can a frog stand ? 



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