Book excerpt: Tells how to read lakes to discover where fish are feeding; illustrates fly retrieve and presentation techniques; how lakes are formed and the physical and chemical characteristics which determine trout foods; discusses types of plant life and how they affect feeding. Comprehensive treatment of different types of trout food found in lakes and how to imitate each with artificial flies and the techniques for best presentation. Comprehensive treatments on each of the trout food sources. 165 informative illustrations and 93 photos (38 in color) to help teach you what to look for -- technique and insect-wise. Color plates show most successful flies.