OF MAN AND TROUT 101 



turbed by any ripples, eddies, etc., I found that all 

 objects in the horizontal plane were invisible to me 

 beyond a distance of about 20 feet : the head of a 

 shark coming towards me would be visible at about 

 17 feet, while its tail would at the same time be quite 

 invisible and lost in the misty wall surrounding me. 

 It may be, therefore, confidently assumed that the 

 wader, even when faced by the trout, will, as far as 

 his waders are concerned, be unnoticed by the trout 

 at a distance of from 25 to 35 feet. 



I wish to acknowledge the help of my brother, 

 Dr. Philip Egerton Shaw, D.Sc., Nottingham College, 

 who assisted me in writing " The Vision of a Trout," 

 and preparing the diagrams. 



