son's symptoms, is sufficiently clear at any 

 rate in the case of the Torridon, which, 

 Mr. Coleridge says, is usually hopeless for 

 fishing when the water is blue and clear 

 from melting snow. The italics are mine, 

 but the evidence clearly shows that lack 

 of sport has nothing to do with blue water, 

 but depends solely on the hostile influence 

 of snow-broth (see Chapter III.), of which 

 that hue is but the outward symbol. 

 On the sight When we come to a consideration of 



of fishes. i / . i 11 i 



how tar nsnes can see, and how, precisely, 

 they view a fly or other object alighting 

 on the surface, we have to speculate with 

 very meagre data. We do not even 

 know for certain whether a salmon lying 

 at the bottom of a pool can see an angler 

 standing on the bank unless his shadow 

 HOW far can falls on the water. We surmise, indeed, 

 from internal evidence that it can. Yet 

 it has been contended, even, I believe, 

 demonstrated, by a German anatomist 

 that a salmon cannot see farther under 

 water than six inches, measured horizon- 

 tally. What the fisherman, however, has 



