A practical compendium for curious readers that teaches how to observe nature and perform experiments across physical and natural sciences using simple, inexpensive materials. It begins with open-air studies of plants, insects, and atmospheric phenomena, then offers hands-on demonstrations in mechanics, hydrostatics, heat, light and optics, acoustics, electricity, magnetism, and chemistry. Sections explain optical toys and illusions, sound devices and early communication instruments, and domestic applications of applied science, while providing instructions for small engines, aquaria, and laboratory setups. Mineralogy, geology, and aërial navigation are also surveyed, with emphasis on instructive explanations suitable for recreation and teaching.