AMPHIBIA (THE FROG) 



(1) Follow suggested plan for the study of the fish, p. 112. 



(2) Then compare the fish and the frog, thus: The fish 



is covered with scales. The frog's skin is naked. 

 Make your comparison tell what both animals pos- 

 sess. Don't say the fish is covered with scales while 

 the frog is not. You might infer that the frog was 

 covered with feathers or fur. Make twenty compar- 

 isons. 



(3) Define a frog. 



(4) Compare your definitions of fish and frog. What do 



you find they have in common? 



STUDY OF THE LIVE FROG 

 1. Collecting. 



Wear rubbers or rubber boots, and walk along the edge of a 

 pond or stream where you have heard the croaking of frogs. 



(1) Do all of them croak? 



(2) Look for small ones in the grass and weeds along the 



bank. Catch them by sweeping the net along over 

 the vegetation, and carry them back to the laboratory 

 for the tank. 



(3) Observations. 



(a) What does the frog do which results in a ''splash" 



into the water? 



(b) How do they strike the water? 



(c) Do they stay near the surface all the time. If not, 



how often do they come to the surface and for 

 what purpose? 



(d) How do boys get a chance to shoot frogs? 



(e) When a frog floats in the water, how much of it can 



you see? 



(f) Color. 



(1) How does the color of its upper surface compare 

 with that of its surroundings? Purpose of this 

 color? From what enemies does it protect it? 



132 



