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LIVING CREATURES. 



eye has no lid. The nostrils are a little in front of the 

 eyes. The ears' where are they? Fishes hear, be- 

 cause gold-fishes kept in ponds are trained to come to 

 their meals at the ringing of a little bell. 



Some fishes make noises, evidently for the purpose 

 of calling their mates. The cat-fish utters a gentle, 

 humming sound, perhaps to call its young; for it 

 broods its young as a hen broods her chickens. Fish 



Bull-head. 



have organs for hearing, and these are near the back 

 of the head. They are covered not open; and the 

 hearing nerve connects with the air-bladder, as if to 

 carry sound through the body. The sense of touch is 

 in the lips. Bull-heads and cat-fish have Jong barbels 

 hanging from the sides of their mouths. Quite, likely 

 these are feelers like the whiskers of a cat. From 

 this resemblance the cat-fish gets its name. 



On the side of the head is the gill cover (gc}. 

 You may watch its motion in the gold-fish or the min- 

 now. The gills within are so arranged as to bring the 

 cold red blood of the fish in contact with the air 

 which is mixed in the water. The water passes in 

 at the mouth, over the gills, and out under the gill 



