142 ANIMAL LIFE UNDER WATER 



A ripple caused by a breeze will help to con- 

 ceal the angler to a very considerable degree. 

 When the surface of the water is disturbed, dark, 

 dancing ripple lines encroach upon the *' win- 

 dow" all round and diminish its size. These 

 lines are seen in the first illustration on the 

 plate opposite. 



In the centre illustration on the same plate 

 an angler is shown by the side of an observation 

 pond, with the wind rippling the surface of the 

 water. 



The third photograph illustrates how the 

 image of this angler was masked by the ripple 

 lines. This photograph was taken from a point 

 two feet under the water at a distance of 

 twenty-five feet. The white cross marks the 

 position of the image of the angler. When the 

 breeze dropped, the arc receded, and the angler 

 stood up clearly above the observer. 



Broken water has the same effect, and in 

 rough water the image above the "window" 

 disappears altogether. On the next plate are 

 three illustrations — all of a fisherman in the same 

 position, viz. seven feet distant from the observer 

 under the water. The first photograph was taken 

 in running water with the surface broken. In 



