Practical dry-fly fishing . l Dry-Fly Fishing ling it when hooked, with the shortestpossible length of line out. What rarejudgment would he have .who alwayscould place himself in that one spotthat marked the limit of invisibility,and yet was the nearest possible to thefish! While trout have other senses, yetthe sense of sight is the only one towhich it is necessary for the careful an-gler to give particular heed. There-fore, he must know something aboutthe limit of a trouts vision before hecan judge correctly as to whether thefish can see him. All trout he withtheir heads up-stream, or at leas
Practical dry-fly fishing . l Dry-Fly Fishing ling it when hooked, with the shortestpossible length of line out. What rarejudgment would he have .who alwayscould place himself in that one spotthat marked the limit of invisibility,and yet was the nearest possible to thefish! While trout have other senses, yetthe sense of sight is the only one towhich it is necessary for the careful an-gler to give particular heed. There-fore, he must know something aboutthe limit of a trouts vision before hecan judge correctly as to whether thefish can see him. All trout he withtheir heads up-stream, or at least fac-ing the flow of the current; in the caseof deflected currents, they face thesecurrents. Drawing an imaginary circlearound a trout, it can see objectswithin that portion of the circle infront and on either side, covering about [142] Angles of a Trouts Vision 300 degrees; this refers to objects onthe horizontal plane of the eye of thefish. There will remain then an arcof invisibility behind the trout of about60 Fig. 9 The eyes of the trout are at T; A T B and B T C tae angles of SO de-grees each. A B Cls arc of 60 degrees and is^the zone of iovisibilityof objects on the same horizontal plane as the trout. When the angler is wading, naturallyhis rod and the upper part of his bodyare above the horizontal plane of thetrout, and they may come within thevision of the fish at a certain point [143] Practical Dry-Fly Fishing above and behind it. In discussingthese questions, however, the laws ofrefraction would have to be gone intofar beyond the limits of this the surface of the water is nat-urally rough, or is ruffled by a breeze,the angler need not concern himself somuch about keeping out of sight; whenbehind the fish under theSe conditionsa short line may be used, and the fineand far off casting be left for the still,clear pools with glassy surface. What a never-ending study does thisquestion of exact position—^the onepoint of vantage—under ever-vary
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