MLS of one man in rowboat on lake. MS of same and of him stopping near shore, of him taking water samples with special equipment. MCU of equipment in water, of man removing equipment from water, taking samples and lowering equipment into water again. More shots of same. MCU of man putting water samples in plastic jars, of him adjusting gadget on rope, removing equipment from water. CU of oar in water to rowboat moving away. MSs of weeds on lakeshore and summer foliage. CU of lilly pods in water. CU of rock in water. CU of lilly pods and rocks. MCU of something floating on top of shallow water. More shots of shallow water.