This student fieldbook provides exercises for a three-week course in limnology. Exercises emphasize applications of knowledge in chemistry, physics, and biology to understand the natural operation of freshwater systems. Fourteen field exercises include: (1) testing for water quality; (2) determination of water temperature, turbidity, dissolved oxygen, carbon dioxide, alkalinity, acidity pH, phosphates, nitrates; (3) sampling at shoreline, in open water, and bottom mud; and (4) examination of samples at those levels. Notes for four telelessons, data tables, and apparatus diagrams are also included. (CS)