1. Measurements were taken on the hemoglobin (grams per 100 ml) in the blood of brown trout. The trout were placed at random in four different troughs. The fish food added to the trough contained, respectively, 0, 5, 10 and 15 grams of sulfamerazine per 100 pounds of fish. The measurements were made on ten randomly selected fish from each trough after 35 days. 2. A bleach experiment was run to study the effect of different bleach concentrations and the effect of the type of stain on the speed (in seconds) of stain removal from a piece of cloth. The bleach concentration was to be observed at 3, 5 and 7 teaspoonfuls of bleach per cup of water, and three types of stains(blue ink, jam, tomato sauce) were of interest.

3. An experiment was run in order to compare the light intensities of different brands of light bulbs. Three brands were selected, and coded as 1, 2, and 3. Brand 3 was cheaper than brands 1 and 2. A further factor that was examined in the experiment was the effect of the percentage capacity of the bulb, which was controlled by the amount of current being passed through the bulb. Two levels of capacity were selected, 100% and 50%. The experimenters wanted to compare the treatment combinations for both 60-watt bulbs and 100-watt bulbs. Comparison of illumination between two different wattages was not of particular interest, since 100-watt bulbs should be brighter than 60-watt bulbs.