Popular Books on Natural Science / For Practical Use in Every Household, for Readers of All Classes

The work offers concise, practical explanations of natural science for general readers, covering experiments and concepts such as methods for measuring the Earth's mass, motion and velocity, properties of light and distance, basic astronomy and meteorology, and the chemistry and physiology of nutrition. It explains food composition—proteins (albumen and casein), vegetable gluten, fats, sugars, starches, and mineral salts—their roles in the body, and how different foods convert during digestion; it summarizes experimental findings on digestion times and practical dietary guidance for household use. Emphasis is on clear demonstrations, everyday examples, and applications to health and daily life.