In this third book, the author examines the phenomena that air and water themselves furnish to people. Then these subjects are naturally associated the other subjects contained in this book--light, heat, electricity, etc. The subjects of this book are those which are commonly ranged under the general term Natural Philosophy. The author frequently uses analogies throughout the book. Many experiments are presented. [For "The Child's Book of Nature for the Use of Families and Schools Intended to Aid Mothers and Teachers in Training Children in the Observation of Nature. Part 2: Animals. Revised Edition," see ED623627.]