ATTITUDES EXPRESSING EMOTION 5 



'the only indication to the outside world of the tragedy 

 that has been enacted. The pike then turns the dace 

 round with a jerky movement of his jaws and swallows 

 him head first. 



Occasionally when a pike is advancing on a fish 



>he sees something about it which he does not like. 



I Doubt entering his mind, his muscles relax, his back 



I becomes arched, and he hangs motionless in the water 

 watching the object of his suspicions. If reassured, he 

 will again become rigid and advance to the final attack, 

 but if his suspicions are not allayed, he swims off as 

 if nothing had happened. In the illustration, " In 

 Doubt," it was the size of the meal that made the pike 

 dubious and saved the little fish. 



Not infrequently the final rush ends in failure, and 

 the prey escapes. Then a complete change comes 

 over the rigid pike, and with arched back and angrily 

 snapping jaws, he sinks to the bottom a disgusted and 

 disappointed fish. 



When a fish is alarmed he assumes a defensive 

 attitude and becomes pale, or actually changes his 

 colour. 



In the three illustrations of a perch showing alarm, 

 the top photograph shows the fish resting on the ground, 

 with her body supported on the tail and pelvic fins, 

 while all the other fins are seen to be lying flat. The 

 glass of the tank in which this fish was photographed 

 was now tapped, and the perch being startled, up went 

 the second fin on her back. A further tapping, and the 



