92 ANIMAL LIFE UNDER WATER 



of the wader blends into this combined 

 landscape. 



When a bird stands in the water the observer 

 below, the surface sees the upper portion of 

 the wader as described, but in addition he 

 sees the legs in their true position under the 

 water. 



On the plate opposite a young heron is shown 

 standing in a stream. The legs of the bird cut 

 the water at the level of the arrow. The lower 

 portion of the same plate shows how these legs 

 appear to the observer under the water. An 

 arrow again shows where they enter the water. 

 All above this level is merely reflection from, the 

 surface. 



I will next draw, attention to the illustrations 

 of the heron seen above the arc of the observer's 

 "window." 



On the plate opposite page 94 are three 

 photographs. The first is a picture of one of 

 my observation ponds, with a stuffed heron 

 placed in the water. It is in the position 

 assumed by a heron preparatory to striking a 

 fish. On the right is shown the appearance 

 of this stuffed bird seen from eighteen inches 

 below the surface and at a distance of three 



