The development of agricultura chemistry. Chemistry of living matter. Physical state of matter. Carbohydrates. The lipids. Proteins. Enzymes. Biological oxidation. Seed germination. The soil and it relation to plant growt. Fertilizers. Plant metabolism. Farm chemurgy. Foods and feeding stuffs. Digestion of foods. The chemistry of blood, lymph, and body tissues. The vitamins. Energy metabolism. Carbohydrate metabolism. Lipid metabolism. Protein metabolism. Protein nutrition. Mineral metabolism. Mineral nutrition.