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This text is arranged in six parts. Part I considers the foods, such as the inorganic substances, the carbohydrates, the lipins, the simple and complex proteins, and the hydrolysis, digestion and assimilation of these substances. This part contains much information. The properties of protoplasm are discussed in Part II. In these chapters are considered the diffusible and colloidal constituents, the physical and chemical properties conferred by these constituents, their variations and interactions. In Part III is considered the chemical correlation through the blood and lymph of the respiratory, digestive and circulatory systems, as well as the general metabolism. Part IV deals with the chemical processes underlying and accompanying life phenomena, such as the energy transformations in living organisms, fertilization and early development, growth, diet, etc. The products of tissue activity are discussed in Part V, and the energy balance of the organism in Part VI.
There is a great diversity