... the only important points. Izaak stumbled on the idea of Mr. Stewart (author of The Practical Angler) saying, 'for the generality, three or four flies, neat, and rightly made, and not too big, serve for a trout in most rivers, all the summer.' Our ancestors, though they did not fish with the dry fly, were intent on imitating the insect on the water. As far as my own experience goes, if trout are feeding on duns, one dun will take them as well as another, if it be properly presented. But my friend Mr. Charles Longman tells me that, after failing with ... — Andrew Lang's Introduction to The Compleat Angler • Andrew Lang
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