Rollo’s Philosophy. [Air] is a classic children’s book by Jacob Abbott, first published in the 19th century as part of the beloved Rollo Series. In this volume, young Rollo embarks on a journey of discovery about the natural world, focusing on the element of air. Guided by his thoughtful and patient father, Rollo’s curiosity leads him through a series of engaging experiments and observations that reveal the invisible yet powerful presence of air in everyday life. Through simple yet profound conversations, Rollo learns about the properties of air, its role in breathing, weather, sound, and flight, and the scientific principles that govern its behavior. The book is filled with practical demonstrations, vivid descriptions, and gentle moral lessons, making complex scientific ideas accessible and enjoyable for young readers. Abbott’s narrative style encourages children to observe, question, and reason, fostering a spirit of inquiry and wonder. Rollo’s Philosophy. [Air] not only educates but also inspires a lifelong love of learning and exploration, making it a timeless addition to any child’s library.