Created by gemini-2.0-flash on 2025-04-29

The image is a chart entitled "Chart 4. Fish, Fish Products, and Oysters," subtitled "Composition of Food Materials" and "Revised Edition," prepared by C.F. Langworthy, an expert in charge of Nutrition Investigations. It is produced by the U.S. Department of Agriculture, Office of Experiment Stations, A.C. True, Director.

The chart breaks down the composition of different fish and oysters into their nutrient components. A color legend identifies the different components: protein (red), fat (yellow), carbohydrates (gray), ash (brown), and water (green). A separate legend indicates that a square inch of fuel value equals 1000 calories.

The chart shows data for cod (lean fish), salt cod, oysters, smoked herring, and mackerel (fat fish). Each food is illustrated alongside its nutrient percentages and calories per pound.

• Cod: water (82.6%), protein (15.8%), fat (4%), ash (1.2%), 300 calories per pound
• Salt cod: water (53.5%), protein (21.5%), fat (0.3%), ash (24.7%), 400 calories per pound
• Oyster: water (86.9%), carbohydrates (3.7%), protein (6.2%), fat (1.2%), ash (2.0%), 230 calories per pound
• Smoked herring: water (34.6%), protein (36.4%), fat (15.8%), ash (13.2%), 1305 calories per pound
• Mackerel: water (73.4%), protein (18.3%), fat (7.1%), ash (1.2%), 620 calories per pound

Created by gemini-2.0-flash-lite on 2025-04-29

This is a vintage educational chart from the U.S. Department of Agriculture, Office of Experiment Stations, directed by A.C. True. It details the composition of various food materials, specifically fish, fish products, and oysters. The chart is labeled "Chart 4. Fish, Fish Products, and Oysters." It was prepared by C.F. Langworthy, who was an expert in charge of Nutrition Investigations.

The chart utilizes color-coded diagrams of fish and an oyster to represent the proportions of different nutritional components: protein (red), fat (yellow), carbohydrates (brown), ash (gray), and water (green). Each food item shows the percentage of each nutrient and also includes "Fuel Value" in terms of calories per pound, with a visual representation where 1 square inch equals 1000 calories.

The examples of food items presented include:

• Cod (Lean Fish)
• Salt Cod
• Oyster
• Smoked Herring
• Mackerel (Fat Fish)

The chart provides a simplified, visual understanding of the nutritional content of these foods. The style is consistent with educational materials of its era. The text is clearly legible and easy to understand.